There's a lot of factors that could give other comics just a randomly huge boost--either from promotion outside the platform (so if they had a twitter that went viral, or if they were featured on a popular podcast or something like that) or promotion inside the platform (I got a lucky feature once where...yes I applied to a contest that required me to use my skills...but also it's still luck because there's hundreds of applications. So for a novel that typically only gets 6 views a page and 1 comment, I randomly have a first page with 1000+ comments on it because of that contest. But, my views are back to where it was before.)
the way I've heard it described, is that there's 2 growth rates. If you have a line graph and it's slowly going up--that's your natural rate of growth--but then you also have spikes of growth from when promotions or viral stuff happens. Those are really helpful, but in general, your growth will go right back to where it was after the spike is over. It's fine. that's just how the internet works:

most of the posts we see from other artists are the ones that went viral--they're in a spike period. We don't really see them at their normal growth rate period, so it's easy to think "wow, if they got 200 subs in one evening, they'll have 1000 in a week) but truth us, the spikes are a little too short for that. Unless they are constantly promoted, most people have the same slow and steady growth, and that's just down to quality, networking, marketing, having enough quantity and consistency over time, youknow, the boring stuff.
There's also a thing where your type of comic can absolutely dictate it's success on a platform--so some comics are just already what Tapas is pushing, they're going to naturally float to the top. Other's are more obscure, no one is searching for them, they'll tend to sink. Kind of the nature of our current platforms on Webtoons and Tapas alike.
Overall, focus on your natural growth, and still apply to stuff that can go viral or be good for promotion--but like...the natural growth stuff is where the meat and potatoes are really at.