Xanathars, Tasha’s, phb, dmg, mm, scag, Volos, mordenkainens and a variety of the adventures including the saltmarsh and yawning portal collections.If you consider your 5e Library "complete" (not that you said that), what 5e books do you own?
Some other stuff with that. I just feel like I have years of options. I will never play 1/5 of the subclasses and many it’s no big loss! But rules and options wise I feel very covered