The longer I've been on the internets, the longer I find this to be common.
On average, around 10% or so of your audience will actually interact with you (sometimes even less). Some might leave likes, but not everyone really comments. Hell, some are basically lurkers who just binge and wait until the latest episode to comment. I definitely know I see-saw between being active and being a lurker. Not even with webtoons, but also with things like fanfiction and posting art online. I grew up kinda seeing that trend, especially on Deviantart.
As of now, my Webtoon stats are 13.1k subs for Our Universe.
My Tapas stats are 377 subs for Our Universe.
On average, I have around 400 - 600 likes/per episode, and around 25-40 comments, give or take. That's for Webtoons.
On Tapas, I have around 20-40 likes and around 10-20 comments, give or take.
Since starting Patreon in 2018 (?), I've had around 8-10 patrons, on and off.
Granted, I find that's because I don't really advertise myself as much as I could (or really update frequently). Feel if I did that even more, I'd have more interactions. But even then, I'd find that most of my engagement would be around 5%-10% or so of the total subs.
But this doesn't even count the people I've interacted with on Twitter or Discord. Some people send comments that way because that's just what they prefer. Not to mention, I still don't know if Webtoon shows ALL of the data. There was still that thing with them not showing international views.
Even someone with 1.8m subs doesn't really get every person commenting. Cursed Princess Club on Webtoon has 1.8m subs, but they average around 100K likes/per episode, and get around 4k comments. Course, that's a lot to someone who might only have, say 100 subs. But for what they have, it's still not everyone -- it kinda evens out.
Back when I was on DA, someone with 20K watchers would get around 1k likes and maybe 200 comments (that is, if it wasn't a back and forth between a few users). Again, at the time, I only had 137 watchers, give or take; but for their stats, it basically evened out.
I wouldn't say it doesn't matter in the long run. I'd just say that the internet has made it easier to realize that not everyone actively engages with each piece of your media. Or rather, not every piece of engagement we get comes from the same place. And sometimes? Sometimes you're not getting all of the data -- sometimes, it's just not as accurate as you think it is.
So I just...don't sweat it. I take it as I go, and that's been doing well for me so far.