As someone going to an art class to get good at art rendering is hard even with multiple years under your belt, I'm someone who's been drawing since I could hold a pencil as well
It does get a bit easier after multiple studies and illustrations with the same/similar process, knowing how lighting and colour works helps as well
Sorry for the little ramble haha not letting those hours of suffering because of rendering go to waste

ive been a artist since i was a child and i also. do not know how to render