Facetanking or kiting is literally the only option you have. Increasing his hit points or how hard he hit does not make him “harder” it just increases the gear requirement, not skill.
A good start would be introducing actual mechanics to the Butcher. Considering Blizzard is missing this from their Core Combat Mechanic Toolbox however, you will not ever see anything actually difficult. It is an artificial form of difficulty much like Uber Lilith. Dull 1 shot mechanics with bad RNG/Hitboxes that appeared in games 2 decades ago - yawn.