@klishtakara there’s pixelfed. It’s not a mastodon instance, but it’s federated to mastodon. Pixelfed is to instagram what mastodon is to twitter, but mastodon users can follow your pixelfed account just like they would another mastodon account. There’s different instances for pixelfed just like mastodon, but I don’t know much about them.
Here’s a list of instances: fediverse.network/pixelfed
And here’s a list of other fediverse networks: fediverse.party/en/fediverse/
Sunbeam City is a anticapitalist, antifascist solarpunk instance that is run collectively.