[2022] more ancients in my hybrid settlement

You can find more Ancients underground, but they are a finite resource per map. If you find all the underground ancients, or you get unlucky and there are naturally none, you might have to migrate to a new tile.

Do you mean Ancient settlers showing up to your settlement, like the settler wave Humans get? If so, they don't actually get those because their populations are so small. You should get the occasional one Ancient that shows up, but they are rare.