Pundits like to claim that Mastodon is failing, but I find it to be a lot more active than any of the other new social sites and I get a lot more engagement there.
I have around 780 followers on Mastodon and 1200 on Twitter, but I get many more likes, replies, and reposts on Mastodon.
Yesterday I posted this same picture on both Twitter and Mastodon, and immediately got many more likes and reposts on Mastodon than Twitter.