I made some unfortunate changes to my uni world and figured might as well reset the whole thing. I dont really care about any relationships with the sims in that world anyway.

I googled around and found that deleting the university nhd file should do the trick and reset the whole world (my sim is back in her homeworld). However, I saw some mention of deleting the ”exportdb” file as well, but couldnt really figure out what kind of effect that would have on my game. Would it be safe to delete that file as well or will that have some unfortunate consequences that I might not want? or maybe a better question is should one delete that file if they intend to reset a ”sub”-world?

I don't know exactly, but here you get information about the file, at the bottom is another link
https://www.nraas.net/What-are-the-Trav ... hey-so-big