I don't make comics, I make novels but making people come and view the product you made should be the same no matter what I make.
For me personally, when I make a novel I first drop by reddit and go to the r/writing subreddit and promote my work on the megathreads.
If I'm making a short story, ill post it on r/shortstories with a link at the bottom in case they want to see similar work, something like this. I'm sure there is something similar for comics.
After doing that, I see the genre I make and go to the corresponding genre specific subreddit to promote my work there, again something like this.
I use reddit a lot, and it has helped me get quite a bit of views despite me being here for less than a week. In case you haven't noticed, I only exclusively use reddit, I don't have much experience with other platforms
Good luck!