Frost movement! Ah, my favorite part, always made me think of Queen Elsa and her icy castle.
Seriously. The incorrect landing of r.h., and the fatigue of playing mordent (I suppose you mean by trill) --- This is something that best to consult your piano teacher, or, if you don't have one, someone experienced player or even music student.
They can recognize for you which part of your hand is unnecessarily stressed.
But several suggestions here. First, find a well edited score. What I think is best to buy an Urtext (i.e. being faithful in notation to the original edition whenever possible), and consult an edited version perhaps on IMSLP.
They often has good fingering recommended to you.
For example, the first landing of right hand to the low register, if using 2 (rather than 1), is easier because the right hand is "in an oblique manner".
And struck the key only after you find it, not just "banging" it. Here piano is marked, so no great force required. This shall improve precision.
Also if you change finger playing mordants it will prevent fatigue, for example, one with 3532, another 1432, another 2421 etc.
I am surprised that you didn't complain about the l.h. octave tremolo. I always find that causing fatigue.