My very first, second and now 3rd attempt to test out Mastodon has ended the same - didn't find any interesting content or people, no reason to stick around. From memory, it feels a bit more neutral than BlueSky, but still left-leaning and a bit negative. 

What Mastodon would need for me to consider it: Following of topics and users who talk about those topics. I'd want an improved UI too - Id probably look at some of the other clients, the main joinmastodon client UI is not that great.