I was wondering, I've been playing 8 days in game time, and still only have the original affinity given to me when i started. I wonder whether there is a mod that could make affinities more available and interesting. So many of them are useless also.

There is an Affinity fixer which allows you to replace the useless affinities but only if you have them in xorcism, Stealing, Lockpicking, Catapult, Traps, Ballista, Trebuchet, Thievery, War Machines or Fighting
https://github.com/revelation343/AffinityFixer/releases/latest

Not sure what else there is apart from the Affinity Orbs

This is something i already thought about and i am still planning on a feature about this issue. Please stay tuned :)

a function to change affinity has been added, please check patch notes:)

That is absolutely amazing, thanks so much for adding that. It really makes a difference.