Webtoons has been really good to us. I was initially cautious of the audience as I'd heard a lot of people talk about the young readers, "it's too short" comments, etc etc. Luckily, we've had none of them. We generally update two pages a week and never mess with the schedule though, so that consistency could be the key?
We'd managed to reach 500 subs very quickly, within the first few updates. And then we got to 1000 a bit slower but still good, roughly about 60 new subs every update. Then a few days ago, out of nowhere, we were put on the "Recommended Titles" section of Discover – something I didn't think would ever happen.
I'm shaking my fist at the timing though, as we're now on hiatus between chapters, though we do have new non-narrative content still going up during that time. We've managed to get 500+ new subs since we were spotlighted, which has really boosted our confidence.
My advice is to just keep updating. Don't get downhearted because, out of nowhere, you might get that light shined on you too and it'll encourage you even more.