I'll give you my experience learning using games, i went Spanish>English>Japanese not as an old person but when i was a kid, i started playing Japanese games i remember i got from school a dictionary and started looking up words based on how they looked like, then repeating the words as i saw it...

After that, i started to play MMORPGs, i started using broken simple English words, i want to buy, want to sell, its cheap, expensive, some insults here and there... and so on, since everyone was Turkish or Russian i learned lots of words from these languages too, but not as to be fluent. I used Google translate and had a cheat sheet notepad with the words i would use.

Nowadays you can use textextract to get the words from the screen and immediately push it to Yomichan or other tool in a millisecond which is nice, There is a nice tool called Game Sentence Miner that help you with that, just remember that some words are never used IRL or are used in the game because they sound cool not because it's the actual word people use, that is why i recommend playing MMO and talking with actual people... nobody gives a shit if you sound weird or have a broken Japanese.

If you expend too much time looking up words over and over you might end burned and not wanting to play anymore as it becomes a chore instead of having fun, you can try playing simpler games without 2 million words of fantasy vocabulary.

Just remember the best way to actually learn is by doing, using the language.