I cannot think of any other way than manually in the database.
The instance admin of the instance where the community is hosted has the power to change the moderators, so just reach out to them. As many others have commented here, some instances may already have procedures in place for that.
Fun stuff, I also had a problem with mine, for me it was that I did not correctly configure my reverse proxy so that POST requests were not routed to the backend but just timed out, as soon as I fixed that everything worked perfectly.
Well, the camera itself is just an art project.
But I have no idea if the person who posted it with that text is delusional or trying to be funny.
On Mastodon everyone frowned upon the Twitter mirrors, I suspect it would be the same here.
They are listed on the instances page underneath the connected instances.
https://de.wikipedia.org/wiki/Wappen_der_Republik_Österreich