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I’m gonna be honest, Mastodon is kinda trash, on its own. It’s clunky, ugly, and feels like a platform from 2010 (but not in a good way). I think getting people onboard with a Misskey/Sharkey instance is going to be much better. The feature set is a lot closer to Twitter, and it does literally everything Mastodon does, but better.
What client are you using? Those all sound like complaints about the client, not mastodon.
Uh, probably the default web interface. And Masto servers still lack quite a bit of functionality found on other fedi services.