Using Connect for Lemmy, you can login to accounts from any Lemmy instance, not just the 3 your presented with.
Where your home instance is, doesn't really matter, you can subscribe to communities on other instances.
If you search with this format you should be able to find communities on other instances [email protected]
The exclamation is important in case your instances doesn't have that communities info store on their servers yet. It'll force your instance to search for that info on the other instance.
Lemdro.id is another instance, but you can subscribe to their android community on lemmy.world if you follow that formatting