A difficult choice because I hold them all extremely loosely.

Sure, I have some affinity toward my alma mater, but hardly loyalty.

Same with my city, it's a fine town, but my only loyalty is to the friends I have made here, not the city itself. Similarly with my fedi-instance, @stefano does a wonderful job making bsd.cafe a welcoming place, but it's precisely because it would be a non-issue to move to another instance that I remain comfortable here, largely because of the people. If either the tenor of the users/barista changed, there's no particular loyalty to the domain itself.

Political party is the weird one. I've never fit into the shapes of the big parties, so I chose my political party based on the least-unaligned with my values. But my loyalty is to those values, not the party itself, should they change values (glares at what I've witnessed the GOP doing…my Regan-voting ancestors wouldn't recognize the current disaster)

So that’s an easy win.

I have no loyalty to any US political party, although I could conceivably find some loyalty to a syndicalist party if one had any chance of participating in US pol.

If my chosen political party (the one I picked) starts moving in a direction I don't like, I'll find a new one.