For the new kids joining Mastodon, let me share a common mistake I see with new users:
"Mastodon sucks. There is no timeline. It's like a tiny echo chamber here"
What's the mistake you ask? They invariably only follow a few dozen people.
This is what you need to understand about federated platforms like Mastodon: the server only pulls in data from people you follow! So, go out and follow some more people already.
You can also follow hashtags btw. This is great for getting more posts in your feed on subjects that interest you. Go and use hashtags in your own posts too of course.