PixelFed is a free open federated alternative to Instagram.
There are lots of different instances you can sign up at, for example:
https://pixelfed.dehttps://pxlfd.mehttps://pix.diaspodon.frhttps://shared.graphicshttps://pixelfed.fedilab.appIt is part of the ActivityPub-powered Fediverse, so you can follow PixelFed accounts from Mastodon etc. For example:
@earth You can follow the project's latest news at
@pixelfed #PixelFed #Instagram #DeleteInstagram #Alternatives #Fediverse