As far as I know, there isn't an account migration mechanism in Lemmy yet. I've heard (fourth hand at best) that it is in the works but hasn't been implemented yet. You may have to do it the hard way. Copy, paste and search.
Lemmy Support
Support / questions about Lemmy.
There is nothing built into Lemmy, though there is at least one active PR working on it.
In the meantime I made this tool: https://github.com/CMahaff/lasim
It copies subscriptions, blocks, and some profile settings.
There are others too if you search for them.
Can you link to the active PR you mentioned? I can't seem to find it on the lemmy github.
I would just wait before doing any crazy. I would assume they can get a new domain, and migrate current environment there. Probably causes few issues for few days.
If you want to support smaller instances (which is of course good), then you should create new account somewhere.
I have created that account at a smaller instance, and I am wonder how to sync subscribed communities
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