This is personally my favorite nail file -

Makartt Nail File 100 180 Grit... https://www.amazon.com/dp/B06XSV65KC?ref=ppx_pop_mob_ap_share

If they are too thick just keep filing until they are exactly what you want. That step takes me forever but I also love watching exactly what I want come out of the blob that was there when I get it too thick.

I finally broke down and bought an e file but haven’t used it yet.