When I'm frustrated with immersion, I try to shift my focus from understand-most-of-it to pick-out-something I do understand. From that perspective, I do OK, recognizing some common word pretty often. It's not much, but I'll take any small win I can get. On the flip side, maybe pick out certain words that give you trouble and focus on why.

Also, try going back to easier/repeat material. Going back a few chapters in the book or rewatching beginner videos or rereading level 0 graded readers until you've practically memorized them. I tend to find some material I can look at and say 'this used to be hard, I am making some progress at least!'

Motivation is just hard though, good luck!

As someone who's started and stopped a bunch, I'd say remember the cliche: "The best time to do it was 10 years ago. The second best time is now." Don't let any setbacks distract you from making progress. That effort now opens up future possibilities.

Russian is hard, remember that! You have done a ton of progress. I know how that feels and you should know its completely normal.

I don't know specifically about russian, but I recently went "back" and just bought a book from a lower level and did the exercises everyday after work. I feel more confident and learned some words that I had somehow ignored or missed.

Might not be feasible for you, but my advice is just exercising, looking up words you don't know, write a short sentence with a new word (on paper, with a pen) and if you are missing some grammar rules you know of, look that up too.

Language learning as an adult is tough, but with discipline you'll get through.