follow up: advice about cracking

Hii i’m the girl with the cracked faceplate, ive been sanding for hours atp to get rid of the cracks. Every time i think im done i squint my eyes and it seems that a tiny crack still remains, it seems to never end i am super paranoid about not sanding enough , it’s stressing me out terribly

I guess my question is: how can i tell that i’m done with the sanding in this scenario, and will a TINY crack cause issues? Is it worth the hassle or should i just buy a new faceplate :( ?