I personally am going through tadoku catalog right now to get up to a level where I can watch and read random stuff.
I tried a YT method with Russian but I only found 2 youtubers that ware making enjoyable stuff. It was very easy to just switch accounts so a bit of willpower to get through unfun recommended stuff was necessary. Try to use the Algorithm to your advantage. It wants you to stay on youtube. (Sadly I don't want to learn Russian so I didn't keep going)
For Japanese Fediverse look into Misskey (and forks). They have a LOT of Japanese speaking people.
I am already reading a bunch of LN and Anime so switching for me will be easy. I also have a backlog of interesting looking YT channels: ずんだもんの定理, あらゐけいいち and Clear Usui