Enkanomiya:

this one will take a bit of traveling, but depending on how far you are into the game, it'll already be unlocked. once it is, you can easily escape in through Watatsumi and hide among the darkness and islands

I feel like the floating rays and vishap thingies would be your friends. maybe this is how you meet the Abyss, too, since Enkanomiya is technically a part of the abyss

the floating rays are probably your transportation, but if anybody else happens to follow you in and hunt you down, they probably won't even be able to reach the islands at all

lastly, Enkanomiya is pretty unknown. 99% of teyvat's population probably doesn't even know it exists. overall, the greatest hiding spot I'd recommend on this list 👌

Vanarana:

this one is a common one. a lot of fanfictions already exists of it. but that's because ITS A GENIUS IDEA OKAY

it's literally like an alternate universe. If you know the harp tune, you can just live with the aranara for the rest of your life. it's like the chill faerie cottagecore life you always wanted!!!!!

AND each aranara tune is individual to each aranara. so other than the traveller knowing one, pretty much nobody knows the tunes

need I say more?

The Chasm:

this is another underrated one that I rarely see. it's dark and dangerous and spooky, and has lots of hilichurls for you to befriend

they can spend their last dying moments with the creator!! how fun!!!

also a great segway into becoming a part of the abyss

there are a lot more abyss lectors down here, so your protection would be even stronger

you could also stay with that mechanical worm thing that I forget the name of, but he's kind of intimidating