One thing you should do is grab your data for easy moving, you haven't already.
Assuming you're using the default Lemmy web UI (not Voyager, or Photon, or a mobile app, or whatever), click on your username in the top right, and select "Settings".
On the settings page, there's a section called "Import/Export Settings". Click the "Export" button and let your browser download the file.
Then, when you switch instances, you can go into the same Settings page on the new instance, select the file you downloaded, and hit "Import" and you will automatically be resubscribed to the communities you subscribed to.
I'm glad it is now. I remember a decade or so ago, I wrote an APNG decoder, so I was deep in the world of APNG.
And I remember reading various things that made me think MNG was the 'more official' flavour of "animated PNG", and it was absurd to me, because APNG seemed like a much more approachable spec. I'm glad the winds have turned...