Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
Wasn't aware importing your posts is a thing, even if it's with its own tool - pretty cool!
If I wouldn't run mastodon with a hand full of other people already, I'd probably set up GTS and migrate. Though I'd have to see what's there on web interfaces currently, got pretty used to the mastodon multiple columns "advanced" interface.
If I could not just migrate to a new instance, but actually convert my existing (self-hosted, single-user) Mastodon instance to a GoToSocial instance, I would do it tomorrow. I don't want to lose the domain I picked for my Mastodon instance though.
I remember seeing somebody working on a project to convert the Mastodon database to a GTS database, so this may yet happen.
Edit: Found it. It was an issue in the GTS GitHub repo: https://github.com/superseriousbusiness/gotosocial/issues/128