I currently host a single-user Mastodon server for myself but it’s on a very small VPS and I’m wanting to migrate to Pleroma because it’s more lightweight. Is there any way to transfer my Mastodon account to Pleroma without doing the standard migration since I have the Mastodon database for my instance? This is so all my posts are preserved and there won’t be a broken redirect because I’ll be shutting down the Mastodon after Pleroma is up.
Have you checked GotoSocial’s docs on split-domain deployments?
https://docs.gotosocial.org/en/latest/advanced/host-account-domain/
It looks like something you would want. (I will admit I have no experience with it though)