Others have covered it pretty well, but I'd say social media isn't optional at this point.
My publisher asked me to get my following up by 12 thousand (!!!) when we first talked. I was at 3 thousand, and was soo happy about that. When she said the base number for them to be interested was 15k, my heart sunk. I worked hard at it (two posts a day, reply to or like comments...) And also worked on my drawing ability every day. I draw for at least about an hour daily. People see the improvement and like to follow someone that posts a lot, or the algorithm likes that.
I also paid for some boosts and ads, and I think instagram liked that. They worked, anyways!
I made friends with some big artists by talking to them on instagram, and they shared my stuff in a post or a story and that's huge. Also, people seeing that some big artist follows you is a big deal. So, hunt for those white whales!