Sounds like a cpu issue (not yours, theirs) if it can’t even run 69 fos while upscaling to 1080p. Big yikes. MH usually ran pretty well on PC.
I know the cloud option ruined perf in MHW, could see if lowering thst helps at all or playing on medium and see if cpu perf goes up, then trying settings a few at a time to full and see which breaks.
Leading expert on buttons says to use buttons?
Mild shock
Seriously though they are needed for many features especially cars or eyes away