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.
[0] - https://chrome.google.com/webstore/detail/mastodon-chirper/l...