Learning to make good comics is overwhelming, honestly. It's taken me years to get where I am, and I still feel like I have so much still to learn
The thing is, you can get up to a really high level in things like figure drawing, perspective, line quality, colour and rendering and still not attract attention because you weren't made aware that a good comic artist also needs to be good at storyboarding, so they need to also be good at placing the "camera" and blocking the characters in the scene to create pleasing angles of view with nice overlaps and dramatic depth or comedic flatness and thinking ahead about things like the 180 degree rule and how this will interact with other comic rules like "the person on the left should speak first" and "never cross the speech bubble tails!" and "if the character is progressing, they should always move to the right", while keeping everyone's positions in the scene consistent and then if you've got your head around those, hello! It's time to learn Design!
For a solo comic creator, it's wild because while yes, the amazing thing about comics is total creative control over your project, in practice, if you want to make something professional on your own, this means you ideally should be professional level at:
- Illustration (Like just.... all of it. Composition, colour theory + value, anatomy, perspective etc.)
- Character Design and Art Direction
- Storyboarding and Direction
- Design and Typography
- Story writing and dialogue
It's basically like you're making a movie and you're doing literally everything. You're building and lighting the sets, you're making the costumes, you're both directing AND playing all the roles. It's absolutely ridiculous! 
Being aware that these are all the things you need to know, including the "invisible" ones though is a good sign!
I give a lot of advice to and generally try to support developing comic artists as much as I can, and a frequent problem I run into are people who haven't really developed awareness of or respect for the "invisible skills". So they come along and they look at my work, and they compare their figure drawing and faces and their inking to mine and they refuse my help, because they think we're on the same level and that my larger following than theirs must be down to either all the contacts I've gathered in comics in my many years on the scene, or me being some kind of marketing genius (I'm not, I am really not). The problem is, yes, they're not wrong that I'm probably not significantly better at drawing than them. They may well even be better than I am, but they're unaware that through years of experience, I've developed my skills in those "invisible" aspects.
So these artists are there, drawing very beautiful drawings but every panel is like people at mid-distance sitting or standing straight on to the camera in the middle of the panel, and there's no storytelling, everyone is always just plonked there, static and talking about what's going on, which isn't especially interesting because they didn't establish a clear or strong enough conflict or scenario, thinking that their "great OCs" and worldbuilding would be enough. Still, they're convinced the reason I have a bigger following must just be luck or marketing savvy or LGBTQ+ themes because they're just as good if not better at drawing than I am, so they don't appoach me for advice I am desperate to give them and would probably easily allow them to surpass me as comic creators. 
So here's my advice: If a comic has a bigger following than yours, but the character drawings appear less polished or less well proportioned or attractive, try to look for what it's doing well before just assuming "Oh, it's a BL so of course it has readers" or "psh, somebody spent money on marketing". Yes, a BL comic will, on average, have more bookmarks than a non-BL, and yes, spending money on marketing might get attention, but neither of these things will make people click a bad looking advert or stick around and read an uninteresting comic. That person must be doing something right. It's usually making a comic that's attention-grabbing, visually appealing to the audience on the platform, and very easy to get into because it has nice big clear text in nice big bubbles to read on a phone, art that makes it really easy to follow what's happening and doesn't waste time before getting to the point of the story.