You are extremely vulnerable to spiritual attack to be in the mission field with that kind of marriage.
IMVHO, you should get back to whichever place you consider home and deal with your marital issues before you consider going back out.

"1TI 3:2 Now the overseer must be above reproach, the husband of but one wife, temperate, self-controlled, respectable, hospitable, able to teach, 3 not given to drunkenness, not violent but gentle, not quarrelsome, not a lover of money. 4
He must manage his own family well and see that his children obey him with proper respect. 5 (If anyone does not know how to manage his own family, how can he take care of God's church?) 6 He must not be a recent convert, or he may become conceited and fall under the same judgment as the devil. 7 He must also have a good reputation with outsiders, so that he will not fall into disgrace and into the devil's trap.
1TI 3:8 Deacons, likewise, are to be men worthy of respect, sincere, not indulging in much wine, and not pursuing dishonest gain. 9 They must keep hold of the deep truths of the faith with a clear conscience. 10 They must first be tested; and then if there is nothing against them, let them serve as deacons.
1TI 3:11 In the same way, their wives are to be women worthy of respect, not malicious talkers but temperate and trustworthy in everything.
1TI 3:12
A deacon must be the husband of but one wife and
must manage his children and
his household well." 1Tim. 3:2-12
I'm not saying that you are necessarily to blame, but your house is still out of control, and needs more focused attention, first.
I'll address this to
147. I haven't read the entire thread, so I apologize if this is repetitive. This is something 147 should discuss with his wife. If a wife forces her husband to live in a sex-less marriage, and there is no real reason for it (e.g. medical), she is defrauding him. She isn't living well. That could also be seen as reflecting on his not ruling his house well. If he sits down with his wife and explains this to her, that her sin could lead him to pull out of ministry, assuming she is committing to ministry and serving the Lord-- it may make her thing twice.
Have you noticed the Proverbs 31 woman has a husband who takes his seat among the elders? A godly woman's support can help her man minister among the elders. It can help him grow in the ministry that God has him to do.
I suspect you may have talked to her about how her not having sex with you is defrauding you according to I Corinthians 7. You are to provide for one another's sexual needs for a number of reasons, one of which is to help keep you from unnecessary temptation.
There could be any number of reasons for a woman's lack of sexual desire. It could be negative experiences with sex in the past. This could include molestation, rape, or something severe like that. Of course there could be guilt if there were pre-marital fornication or adultery. But it is also possible for women to have a negative view of sex from something less extreme, like being flashed by a pervert as a child or teenager. Some people have a negative view of sex because their parents always talked about it as if it were evil or shameful instead of instilling a positive view of sex in marriage in their children's minds.
Your wife may benefit from teaching on the subject. If you don't think she would be enthusiastic about reading a book or you don't think you could get her to watch a video on sex, why not ask her if she thinks it would be a good idea for you both to put in effort to "work on your marriage." You could both agree to read a book on marriage. Then you carefully select books for both of you, including one for her that addresses her sexual issue. It is good to do this sort of thing even if you don't have a sexual issue.
I have ordered a couple of books for my wife and myself. I ordered
The Excellent Wife by Martha Peace and
The Exemplary Husband, which was written by Martha Peace's pastor. The wife book is a lot more popular than the husband book, which the reviews said were dry. The reviews of the Martha Peace book on Amazon were good. Even the negative reviews made me want to order it. I understand the book urges women to take their husbands' sexual needs seriously and to satisfy them. I haven't read it yet, so I can't exactly endorse it. The husband book doesn't have as many reviews. I've read it is dry. My wife may end up with a more interesting read.
I know you are in China, but if you could get your wife to agree for you both to read a marriage book, maybe you could both study books like this. If she is a reader, you could include some books to help her with problem areas in your book orders. And she may be able to make suggestions for books for you.
You can also study the word with her on the subject. I Corinthians 7 shows us some important things on the topic. Your body belongs to your wife, and her body belongs to you. It is defrauding your spouse to withhold sex from him or her. Sex with the spouse helps prevent temptation.
The following passage shows us that it is a good thing for a man to constantly pursue his wife sexually.
Proverbs 5
15 Drink water from your own cistern,
running water from your own well.
16 Should your springs overflow in the streets,
your streams of water in the public squares?
17 Let them be yours alone,
never to be shared with strangers.
18 May your fountain be blessed,
and may you rejoice in the wife of your youth.
19 A loving doe, a graceful deer
may her breasts satisfy you
always,
may you
ever be
intoxicated with her love.
20 Why, my son, be intoxicated with another mans wife?
Why embrace the bosom of a wayward woman?
If you read this one with her, you can ask for her cooperation in helping you obey the principles in this passage about being intoxicated with her love, and explain to her that this is a good thing.
It also helps to consistently do devotions with your wife at home, praying with her and reading the Bible with her every day or night. These passages could be included in your devotions at times. You could also put together lessons on marriage that include these topics. Or you could be a little less formal and read the passages and discuss them.
Sometimes, it is easier for women to accept teaching on sex from other women. Titus 2:2 tells older women to teach younger women, among other things, to love their husbands. Meeting sexual needs is one of the ways we love our spouse. Books may be hard to get over there. If your Internet speed is fast enough for Youtube, and you can access it, here are some videos you may wish to consider having your wife watch.
These videos are form wives who seem to have really dedicated themselves to being good wives. The 'Wisdom for Christian Wives' encourages women to take their husbands sexual needs seriously, and has a funny story at the end. The video on intimacy is a video by a youtuber who is serious about being a wife and homemaker. The video on loving your husband is by a Russian lady who has a large number of videos teaching younger women. This one is really good for encouraging women to have the right mindset about having sex with her husband. The latter two videos in particular use scripture to explain to wives the need to meet their husbands sexual needs. This comes from women who have embraced the teaching of the Bible on this subject who share from their hearts with their women viewers. I think it is good for a woman with a problem in this area to watch these videos. She would have to be able to understand English, though.
Wisdom For Christian Wives Regarding Sex - YouTube
The Importance Of Intimacy In Marriage - YouTube
How to Love your Husband ( Part 2 ) - YouTube