I feel ya dude. I've been around webtoons since Jan with regular updates 3 times a month and tapas since April with regular updates for 2-3 months with very little traffic, that of course without any interaction other than posting comics.
I did about 26 updates for the past 7 seven months at webtoons and accumulated over 100 subscribers and gaining about 1 or 2 every update for a while. And at tapas is pretty much less 1 for about a month.
It can be disheartening when comparing to other comics out there that you are competing with, but it just make me appreciate those subscribers even more because they enjoy your story and/or art and it encourage you to keep posting for them, Well that's what I feel anyway.
All I gotta say is that just have a little patient and keep frequently updating, it takes a while to grow your comic, but if you enjoy making them then continue doing it for yourself and eventually others would join you on your journey that is your comics. Well that was what I was told anyway.
I have faith in ya, so you should too! Hey look at that, my first time posting on a forum.