I covered a few tips on this over here:
that might be helpful?
(the link/quote looks messy oof but if you click its sorted properly)
...edit for additional stuff...
I tried the webtoon link but it seemed to be broken?
A big thing that catches readers attention is the thumbnail/cover of your comic. It gives you a chance to show off what kind of art style your comic has, to intrigue people with your main character or give an impression about what the story is about. While the logo of yours is nice, it doesn't tell me any of these things other than the title. Which, will show beneath the thumbnail on the site/app anyways. It might be worth a shot to try changing it up.
This thread appears to have died out a bit last week, but it might be worth getting going again?