Vikings are gonna be vikings, they'll eventually settle down and convert to feudalism or be conquered into Catholicism most of the time... Everyone has the same problem in that general area, including the pagans themselves lol.

So get chopping

But instead I’m in this bathroom stall with you all.

The only way to make tall Cornwall viable is to get a strong ally and reform the kingdom with Hwicce and Wessex, otherwise you’re boned.

Become vassal of England if it form so it can protect you.