Well, here is my recommendation:
Make 2 art posts in your social media per week (It can be finished artwork, wips, linearts, sketches, concepts, literally anything), try having the main three: Facebook, Instagram and Twitter.
Then, make 15s / 30s videos (Can be wips, time-lapses, speedpaints, or IRL time sneak peeks) and post them as Shorts on Youtube and TikTok, post them as well on FB, IG and TW. *
Additional ones: Share the images and videos on Discord, Tumblr or Reddit (Or all three)
Of course, use hashtags, try check out at what times your followers tend to be more active so you can get the best out of it. I also recommend getting on websites/apps that allow programming posts in multiple social media. So you only have to make a few posts, but it's already scheduled to be shared in more places.
Now, its not just only having your socials and posting stuff. 1 or 2 days later, try to share your posts on FB groups, use some click-baity question to make people comment. One of the best things or at least behavior I've noticed:
- Make a question that may go to a wrong statement. People love to correct others so that's makes them engage, which ends up bringing up the visibility
- Engage in other people's posts if you have the time, or in communities be it serves, forums or groups. Being seen regularly being active or at least engaging may raise curiosity of fellow creators or people in general if those spaces are for readers too.
The QR code is good for getting local readers, especially in teen spaces. Try to make flyers with art that stands out but isn't bait either. You could also make mini fanzines and sell them for a cheap price (Like, just do them with normal cheap printing paper and stapler, and having a last page about where to read more.
Then this is another recommendation, but you could multi-stream on both Youtube and Twitch at the same time (Restream.Io is good for that) and then you could stream your creative process, comic making, drawing in general and such. Preparing commands or the About Me section on Twitch is important for people that may be curious and see what else you offer.