I’ve updated Micro.blog today to help Mastodon users follow people on Micro.blog. It used to be that if you clicked from Mastodon to a Micro.blog user, you just ended up their blog home page. Now it redirects to a special version of the Micro.blog profile screen which includes a follow form.
This is very similar to Mastodon’s default remote follow form, or Aaron Parecki’s profile page. For more about how to use your own blog’s domain name as your Mastodon-compatible username, see this Micro.blog help page about ActivityPub.