Safe and legal stuff

I’m a daily weed smoker and I drink maybe 3 days a week. My THC tolerance has gotten to an insane level. I’m burning through kush and hardly feeling it. Looking to add 2-3 substances to my routine. No life ruiners, I’m looking for stuff that’s mostly safe. Also legal. Yes, I am aware that every drug has its dangers and can be addictive. So far what I’ve been looking at is Phenibut, Kratom, and some THC derivatives like THC-P. I was also looking at some CBD derivatives and obviously those are mild but I’m curious if anyone knows the strongest one?