Four years later, I was transferred back to my hometown city, where I married a nurse and had a son. Four years later, I was transferred back to my home city, where I married a nurse and had a son.

"Hometown city" isn't quite grammatical, since both "hometown" and "city" are nouns. Alternatively, you can omit "city" and just write "hometown".

WOne day, when I was 25 years old, one day, while I was going shopping with my wife on the street, I happened to meet the director of the Agricultural Machinery Bureau of my hometown. One day, when I was 25 years old, while I was going shopping with my wife on the street, I happened to meet the director of the Agricultural Machinery Bureau of my hometown.

"One day" (and other similar phrases such as "once upon a time") typically sounds more natural all the way at the front.

He told me he was going to promote me to be the deputy director of my office and asked me to be punctual for work and leave on time to make a good impression on others. He told me he was going to promote me to deputy director of my office and asked me to be punctual for work and leave on time to make a good impression on others.

"promote me to be the depute director" is fine, but more concisely, you can consider omitting "to be the".

I evenThe feeling I felt it was unreal. The feeling I felt was unreal.

The way the sentence is worded is unusual, so I fixed it a bit.

I have been workinged as a principal director in two deputy township-level units for 22 years. I worked as a principal director in two deputy township-level units for 22 years.

"I have been working" implies that you are still a principal director, but looking at your next sentence, it would seem that you no longer are.

Now, I work in a principal township-level unit as a deputy director and have been doing so for five years. Now, I work in a principal township-level unit as a deputy director and have been doing so for five years.

Don't forget about putting a comma after "Now" since it's an introductory word. You're adding new information which helps it flow nice.

I dislike asking the higher - -ups to promote me. I dislike asking the higher-ups to promote me.

I dislike asking the higher - -ups to promote me. I dislike asking the higher-ups to promote me.

You don't need a space between the "-"

I hate to fawn onver the higher - -ups and curry favor with them just for getting a promotion. I hate to fawn over the higher-ups and curry favor with them just for getting a promotion.

"Fawn on" isn't wrong I don't think, but definitely much less common than "fawn over".

I hate to fawn on the higher - -ups and curry favor with them just for getting a promotion. I hate to fawn on the higher-ups and curry favor with them just for getting a promotion.

My attitude towards promotion is that I won’t resist if the higher - -ups positively promote me, since it’s not a bad thing. My attitude towards promotion is that I won’t resist if the higher-ups promote me, since it’s not a bad thing.

(1) "Positively" is redundant, because promotions are typically positive in nature, and the reader will understand this. (2) I'd suggest a comma break.

My attitude towards promotion, is that I won’t resist if the higher - -ups positively promote me since it’s not a bad thing. My attitude towards promotion, is that I won’t resist if the higher-ups positively promote me since it’s not a bad thing.

On the other hand, I will never do anything deliberately to get a promotion from them, since it’'s also not (necessarily) a good thing. On the other hand, I will never do anything deliberately to get a promotion from them, since it's also not (necessarily) a good thing.

Personally, I'd throw in the word "necessarily" here, especially because you stated in the previous sentence that getting promoted isn't a bad thing.