I’m not a technical person, so i don’t really know, but from a blog i read about switching from lemmy to piefed, i guess there should be some problems :

I also changed the URL from jemmy.jeena.net to piefed.jeena.net because I don’t want the other instances to be confused when suddenly a different software with different contents is available under the same domain. But I’m thinking to start up Lemmy and unsubscribe from all communities and to delete the one community I have on my Lemmy instance which has only very few subscribers.

That at least would be a somewhat clean way to dispose of this lemmy instance. Oh and I should return a 410 Gone to indicate that it’s permanently gone.