Shameless plug: I created a browser extension to help transition to Mastodon[0]. If you don't yet feel like you can leave twitter.com, but want to explore alternatives it's a great way to get started. Essentially it injects Mastodon posts into your Twitter timeline, so you can retain your existing Twitter following while getting exposed to Mastodon.
That sounds kinda backwards. If I'm staying on Twitter, what's the value-add from having Mastodon posts there? I've witnessed very few individuals drop Twitter completely in favour of Mastodon.
The value add is that you can be a part of Mastodon without having to learn how to use the Mastodon UX. Just one way to increase Mastodon usage for those that like Twitter UX and don't want to have to remember to visit Twitter and Mastodon.
[0] - https://chirper.picheta.me