Hello /ic/, I’m an immigrant from /biz/.

I’m looking at artist’s Instagram pages that draw in such a simplistic style that makes it look easy to draw and they are profiting from mech sales, NFTs, books, courses etc. I want to get in on this but I have a few questions

1) is the market oversaturated and hard to get into?
2) is drawing simplistic and getting popular as easy as I think it was a or is there more to it that makes it harder?
3) what are the practical challenges in trying to earn money with making digital illustrations and growing follower base?
4) what are some tips in making your simplistic drawings actually look good and professional?

Thanks, grandmas