Some people seem to bounce off Mastodon, saying that it doesn’t have the content that they were looking for. I’d suggest that it probably does have the content that you are looking for, but you can’t expect instantly see everything you are looking for from a fresh account.
People have spent years building up their twitter feeds; finding the people they like to follow, and browsing for new things, getting recommendations, and removing they stuff they don’t like. You can’t expect to match that level of content 10 mins after signing up on Mastodon. You will have to look around and tell it what you want to see before it will be what you want it to be.