Actually theres a neat glitch you can take advantage of involving something with the save feature before you go off to fight the Yiga clan leader. Of course I read about it AFTER I did it so I did not get to take advantage of it. Supposedly it makes it so you can raid their place over and over for the big output chests there. I thought fighting the Yigas was very frustrating. I never play on master or hard mode...too difficult for me. My gaming skills are sub par at best. I like fun and friendly game play and a good plot. Botw was sort of a choose your own adventure almost type game because it lacked structure. My SO and I both agree that as far as open world goes Skyrim is far superiorNormal mode is more stingy.
I play Master Mode.
Once you've mashed a few of each mob, the white and gold ones are all over the place. Gems build up quickly.
Killing Yiga clan members whenever you come across them helps too.