Do you know any cool online writing community?

Not very active yet but Gurlic does have a writing community.

https://gurlic.com/writing

We have articles too (with an editor and everything):

https://gurlic.com/homer/the-iliad-book-i

And publications as well, but this needs a lot more work:

https://gurlic.com/classics

Don't know how cool it is, but there's Everything2, which I've landed on from time to time.

https://everything2.com/

https://everything2.com/title/Everything2+Help

I like https://bloggingfordevs.com/ if you are a developer like me. You do not sound like you consider blogging, but you might change your mind after checking us out.

Scribophile is specifically for fiction and peer review.