that sounds like a valuable skill to offer o.o
idk how you can go about it here since i believe offering commissions in this forum is not allowed.
but i'm pretty sure there are a lot of comic artists who could really use a lot of help with 3D backgrounds.
i say follow a bunch of premium Webtoon creators on Instagram and/or Twitter and keep an eye for when they announce they're hiring for assistance (inking, backgrounds, flats...etc) You'll be surprised how often this happens.