You've been on the site for less than a day so you really shouldn't be worrying about this at all, especially not for games like those that already have such large and established communities.

Each game/community has its own standards for who they'll add as verifiers/moderators and under what circumstances, but in general they're not looking to add people who don't run the game and are not well-known within the community.

Generally speaking, one of the prerequisites for being a verifier on any game would be to know the game well enough that you're capable of speedrunning it at a mid to high level. The first step I'd recommend for you is to grind out some dope PBs in all those games and show the communities of each that you're somebody they might want to pay attention to.

I thought you would say something about how bad the verifier is lmao.