I have been learnactively learning / studying English for almost four years.

In most contexts, your original sentence means you first started learning English four years ago. You could fix it by saying “actively learning” instead of “learning,” but “studying” would be simpler.

In the first year, from September of 2019 to July of 2020, I learnstudied English (in a) the way I did when I was in school, but I think I wasted the first year, because what I did in the first year didn't help with my writing and speaking.

“I studied English in the way I did”
“I studied English the way I did”

“In” isn’t wrong, but the sentence sounds better without it.

In July 2020, a female Canadian tutor on Italki who was in Japan then told me about the LangCorrect website, and I think that was when I really started learning English.

“Learning” is fine here, and “studying” would be wrong.

At least I could write short English paragraphs, which I couldn't do a year agoearlier/prior.

You could say “couldn’t have done” but “couldn’t do” is also correct and idiomatic.

So I started to book online lessons to practice (my) speaking.

“My” isn’t wrong, but it’s unnecessary and I doubt that any native English speaker would add it here.

The first online English online school I attended was in the Philippines, and (allmost all) the teachers in the school were (almost all) female.

“Almost all” fits naturally in either location, but not both.

Anyway, I learned/studied English there for a year, and I finally could speak in English.

Either “learned” or “studied” would make sense in this context. I prefer the latter.

When I realized that I couldn't get further improvement, I stopped learnstudying there.

“Learning” sounds wrong to me. It could mean you continued to attend lessons there, but your English stopped improving (you ceased to learn anything from the lessons). “Studying” is unambiguous: you stopped attending lessons there.

But, I just stopped learnstudying in that school, and I didn't stop learning English.

The first instance of “learning” in this sentence isn’t wrong, but studying is more natural. This sentence sentence illustrates some of the differences between studying and learning: studying is actively trying to learn, either on your own or by attending lessons; learning is what happens if your studying is successful (you gain knowledge—you learn), and it also refers to knowledge that you gain naturally, even when you aren’t studying (a child learns to talk, but they don’t study).

After that, I booked lessons on Italki, a lesson per day until / even now.

“Until now” is ambiguous in this context: it could mean you have now stopped booking a lesson a day, or it could mean you still book a lesson a day. For the latter meaning, “to this day” would be unambiguous, but repeating the word “day” like this (per day to this day”) wouldn’t sound good, so I’d use “even now.”

I don't know when I should stop learnstudying English, maybe in one more year.

Even if you stop actively studying English, you might still learn some English (when you see a new English word on a sign somewhere, for example).

I know I can't (I will never) speak English as fluently as a native English speaker does in my lifetime, but I want to speak English not too badly.

“I will never” sounds more natural to me.

My Learning English Journey

InDuring the first year, from September of 2019 to July of 2020, I learned English in athe same way I did when I wasback then in school, but I think I wasted the first year, because what I did in the first year didn't help with my writing and speaking.

After I practiced writing in English for a year, I think I had made a lot of progress.

At least I could write short English paragraphs in English, which I couldn't do a year agoprior.

The first English online school I attended was based in the Philippines, and allmost all of the teachers in the school were almost all female.

They were young and most of them werehad just graduatinged from university.

If you meant they hadn't graduated and was about to graduate, then you can say 'were just graduating'

When I realized that I couldn't get further improvementwasn't improving any further, I stopped learning there.

But, I justonly stopped learning in that school, and I didn't - not that I stopped learning English.

I know I can'twill not be able to speak English as fluently as a native English speaker does in my lifetime, but I wantat least I hope to speak English not too badlyrelatively well.

In the first year from September of 2019 to July of 2020, I learned English in athe way I did when I was in school, but I think I wasted the first year, because what I did in the first year didn't help with my writing and speaking.

It sounds like you learned many different ways of learning in school if you use "a."

At least I could write short English paragraphs, which I couldn't do a year agoprior.

"A year ago," is only for comparing the present time to an earlier time. When comparing the past to the earlier past, use "prior."

The first English online school I attended was in the Philippines, and all the teachers in the school were almost all female.

But, I justsimply stopped learning in that school, and I didn't stop learning English.

"Just" sounds pessimistic compared to "simply" in this case.

So far, I have paid about 50000 CNY for my online lessons, but I still don't think I can speak English fluently.

I can only speak slowly, and often make mistakes.