I translate and proofread TV series and short videos and write scripts, I discovered myself by experience without a BA. Is there a way to expand my work?

Yes, of course you can.
Start with translating simple texts and forward to some body you know to sub-edit.
To be a good translator, at least you need to learn the grammar and sentence structure of both the source and target languages.
This is attainable by reading and/or attending relevant courses.

I highly recommend you to start getting recommendations from your previous employers! Recommendations help a lot in these cases, The more reputable the previous company was, the more likely to be hired!! Another thing you can do as well, is finding a good company and getting a paid/unpaid internship there! sometimes this works as a winning card, but you need to be persistent and take no NO for an answer!