Algumas sugestões de correção:
In the last months I left my job to study and improve my english.
I don’t have problems with listening and reading, but I'm not very good at writing and speaking. So I always visit English Experts and I think I am part of the forum. I participate in the project of speaking in videos and I sometimes practice my writing to get a feedback of my evolution in my studies.
I'm in college taking a course in translation and I practice it with Mangás and Comics, but I hope that in the next 6 months of studying I will trasform my english from passive to active.