As much as I'd love to use Mastodon, both times I tried, I got bored and gave up because I couldn't find interesting people to follow. All of the people I do find interesting are only on Twitter.
But actually worse, because at least those message boards had better defined topics. I can follow some hashtags that I enjoy but in the web gui it's very limited. I've been thinking about writing my own software to help me follow tags alone. Just to participate in relevant discussion.
Otherwise you're just watching people rant in the public feed and if you're lucky you might catch the occasional interesting post.
But I persist because I truly believe in the fediverse concept.