Not a teacher, nor a native.
Welcome, to the forum, Monlay!
There are so many nice people here that I am certain that you will be able to improve you writing skills by posting your essays or asking questions about grammar and getting the answers.
The only advice I would like to suggest to you before you start using the forum is the following.
If you want to post essays, I think it would be very nice if you posted only small (not big) ones.
Have a nice time being here!
Student or Learner