I'm not exactly treatment free, but I am low treatment without pesticides (oxalic acid).
One thing that is supposed to help substantially is small cell comb, which is obtained by using foundationless brood frames. I'm no expert in that realm, but I have noticed with my amateur eye that the bees definitely prefer the foundationless over the plastic foundation - including the top dollar Acorn double waxed stuff. I prefer foundationless due to cost and waste reduction.
Welcome to Beemaster, where we have a variety of styles and approaches to beekeeping. One consistent thing between all members here is mutual respect for each other.