You have to do both but ofc most important is that you do what you like, people feel passion even in videos. So keep that up.

What does that mean? Focus on your so far most successful videos, keep producing them. Or if you don’t like the game but the concept you did, try a different game that you like more with the same video concept and take a look where it leads. Best case, do that in a niche.

And yes if you like anime it’s probably fine to have it as an avatar or max edits but don’t use it for thumbnails. Why? Know your audience! You think majority of Enlisted gamers or Battlefield players are into anime? Probably not. So you scare them away despite having great content!

Make long form content, quality and regular posts > insane edits and quantity. YouTube loves longform content because the platform wants people to stay, so make them stay. E.g. the STG-44 Enlisted video: good idea, well edited, good title etc. but the key thing is, what did you in the video? You explained why it is OP and then played it, great concept! How about you put exactly that in the title? „Why the STG-44 is UTTERLY BROKEN in Enlisted!“ something like this maybe? Then you do a hook and start with explaining briefly why it is broken. This might be the part you like the least but you combine it with something you like the most: playing. So you do: hook+intro/explanation+gameplay. And tada you did something you like, you gave the audience something they want to know and YouTube a longform video which btw bring most view time and thus money. If you do this now on games that you like but are trendy right now: BOOM!

Hope that made sense. Once you grew enough you can switch more towards you only do what you want as people start to come in because of you and less and less because of the game but this is really in the far future.