I got a simple solution to your problem:
How about you just focusing on enjoying the champs you do enjoy & stop being concerned about shit made for other people?
Reading your threads make it sound like Riot is actively hunting down the champs you like & replacing them with things you don't like. Newsflash: The champs you like are still in the game. Bard, Kindred, TK, ASol, Ekko, Illaoi, Taliyah, etc are all still in the game. You said it yourself, you got 2 years worth of content you like (11 champs) not to mention any other champs from before those 2 years. But somehow 3 champs you don't like are a problem. 3 hated things > 11+ appealing things I guess. The stuff you like is still here & are the majority. Then this game is still for you, so go enjoy it. Or do you not actually enjoy those 11+ champs?
We get it, you don't like the champs targetted at a younger audience. You don't like the Star Guardian skins target at fans of magical girls &/or the anime aesthetic. But that's the thing, those are TARGETTED at other players & you don't have to indulge in those things. Stop acting Riot signed a legal contract saying they would only make champs & skins you like. They have to make all types of things that are appealling to all, different sorts of people around the planet. Just because you find something appealing doesn't mean every player will find it appealing. I'm sure there are players out there who hate the things you like & love the stuff you hate. There's going to be stuff that you don't like in the game. But those shouldn't take away from what you do like.
You also make it sound like Riot will now only make things you don't like. No, they're not going to only make "anime-esque" content from now own.
The Star Guardian hype has came & now is on the way out (just a few more days left). The skins team have other, less anime themes to expand upon. They already did so with some while adding a new one in the time since the 2017 SG skins were announced.
The champion team won't, hell they can't, only make "anime-esque" champs from now. Riot has an entire world to expand & they can't represent Runeterra only with characters like Xayah, Rakan or Kayn. That'll just limits Riot's ability to flesh out Runeterra. They showed with Ornn that the direction you're concerned with is not going to happen.
Eventually, Riot is going to make some things you like again. In the meantime, instead of questioning your place in the game every time Riot adds something unappealing for you, you focus on have an enjoyable experience with the appealing elements of the game.
Welp, I rambled on long enough about this subject.