What to do to get that hookah “head high” again?

I’m not sure if it’s just because I’m smoking from cheaply made hookahs from Amazon & should probably invest in a better one or if my tolerance is just that high now, but I miss getting that nicotine buzz from smoking hookah & it was the main reason why I smoked it. I’ve even went months without smoking it just to try again and nothing. It still relaxes me, but no buzz. Depending on what lounge I go to & what type of hookahs they have, I’ll be able to still get that buzz. Has anybody else experienced this? Any tips?? Should I change the coals I use or shisha?? I usually use coconut coals and eternal smoke shisha.