Don't.
The amount of subscribers is never an objective indication of how good your work is. I've seen people with downright professional artwork struggle to get to 100 subs even if they've been posting for well over a year and I've seen... comics in which the drawings were literally stickmen done in MS Paint getting over 500 subs in less than a month. There are A LOT of factors why a work might not instantly get a certain amount of followers, and objective quality isn't necessarily it.
Other factors could be:
-Lack of promotion. Either you're not reaching your potential audience or you already reached the people who were going to be interested in your work on that particular platform, hence why you're not attracting new ones (happened to me on these very forums).
-The platform is... simply not the right one for you. I mentioned this many times already, but my Tapas stats are basically nothing compared to my ComicFury stats. Although I may have way less subscribers on there (31), my comic on that platform has nearly 40k views with an average page view count of 40-50 pages a day. And on Webtoon I have around 194 subscribers, which is higher than what I have on Tapas. Granted, Tapas is also where most of my active commenters are, but like... my entire audience is currently made of 373 subscribers, with quite a bunch of people following the comic from other platforms even without being subscribed. My Tapas audience is less than half of my entire audience. So again, if you're not getting a certain amount of subscribers on Tapas, it doesn't hurt to try other places before declaring your project a failure
-What worked for one creator isn't necessarily going to work for you. One example: I see many comic artists saying how TikTok is a very good platform to promote your work. What most fellow creators don't seem to realize, though, is that TikTok is good as long as the work you're promoting is in your own native language and aimed at people of the same country as you. If you, like me, are from a different country and making a comic in English... TikTok is going to be basically useless, because literally zero native speakers are going to see it. On the other hand, I had MUCH better luck with Instagram reels... something the great majority of creators I talked to seem to struggle with. So yeah, experiences of what "works" can be wildly different depending on the creator, too.
Another thing: you said that you have a webnovel, not a comic. Novels on Tapas are notoriously harder to promote, so their numbers aren't really comparable to comics. Even with incredibly popular premium novels, you'll often notice that, if they had a comic made out of it, the comic actually has far more subscribers than the original novel. Again, this is mostly due to how Tapas tends to promote comics a lot more compared to novels, it doesn't necessarily have to do with the objective quality of your work.
Re: the question of the topic, I just go with the flow. I got in not really knowing what to expect, I'm grateful that I got the number of subscribers I have (especially given how my genre/style aren't exactly what's popular on the biggest platforms nowadays), currently wouldn't mind getting to 500 subscribers across all platforms, but I try not to obsess too much over numbers, 'cos that can get frustrating soon.