>>305391Pretty much exact same story, except I was born in the Ukraine. People will tell you to consume Russian language content in the form of video games, movies, books, etc. but that's just parroted advice from people that have never actually learned a language (or tried to maintain it). Watching a movie once a week, or reading a book every once in a while, isn't going to do much for your language skills, except for maintenance at best. There's not enough repetition, not enough exposure, and not enough time for things to seep into your long-term memory. You might pick up a new word or phrase, every once in a while, but that's it.
This sort of 'comprehensible input + immersion' style of language learning requires a shit ton of 'volume'. You need to be blasted with the language you want to learn 24/7 by television, books, newspapers, ads, films, games, and most importantly the people around you. Whenever I used to visit family on vacation, my language skills would noticeably improve, even just being there 2-3 weeks, but then coming home they would subsequently dwindle.
But yeah, there's really not much you can do. If you really want to improve you have to put in the work and essentially study just like anybody else learning the language would have to, except you're starting at a higher language qualification than a complete beginner.
The alternative is to just cruise and maintain, talk to your mom (that's my biggest source of language retention), read a book every once in a while. That's about it.