Since this new Tapastic update, I've been getting way more than before.
I'm doing the exact same thing I did before though.
But yeah basically what @AnnaLandin said.
I'd say promote it where ever you can. Facebook is good one. if you join comic groups, you can get it out there.
Twitter is okayish. DevaintArt too, post in the groups.
Be consistent with style, update regular and you soon be on your way.
I've definitely seen a significant dip in subscriber growth for my two updates since the Tapas update. But I still feel like I need a couple of more updates to tell if it's a fluke, if it just has to deal with where the story is right now, or if it's just that less eyeballs are seeing my comic pop up in their feeds when they're looking for something to read.
Five updates ago, I gained: 7 subscribers.
Four updates ago, I gained: 11 subscribers.
Three updates ago (a page that I felt was comparatively weak, actually), I gained: 19 subscribers.
Two updates ago (first post Tapas update), I gained: 6 subscribers.
So far, with my update last Friday, I've gained: 4 subscribers.
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Definitely. It's also good sense to take time to observe trends for your work and brand to help inform your decisions on how to improve, grow and reach more people. Obsessing and worrying and getting anxious aren't helpful, but objective observation is super important ... to any artist. Or anyone at all, really.
There was a bit of a lull after the update for me. But I think that ws due to the bugs and such, since there were delays in when new people could see updates. However I think it's getting fixed since I got a few subs recently.
But what others are saying are important for the long run. Getting subs takes time, keep updating and letting others know about your comic and you'll get them.
Gaining subscribers is not an easy task. I usually only get new subscribers if i've added a page recently and since the recent site changes, i've noticed a slight decline. Your best bet is advertising your comic outside of Tapastic as much as you can and wherever you can using twitter, facebook, tumblr, deviantart, webcomic forums, you name it. Unless your comic is lucky enough to land in the 'Staff Picks' section, getting subscribers is an upward battle for most.
I find it very hard. Mainly b/c I'm new here, but I'm updating consistently(1 page per week. Have not failed to upload on any given week yet) and I got like 1 sub and no comments/likes. 
If you wanna read or sub to my series: https://tapastic.com/series/DungeonHeart31
I'd greatly appreciate anyone who would read, comment, sub on my work. 
I clicked your comic and noticed that there isn't a series thumbnail? Having an attractive thumbnail makes people interested in your work!!
I only started posting 1 month ago, but somehow my subs went up like crazy and I didn't know why.
I've gotten a lot of critiques before that are very valid, some of which mention things that could drive away potential readers i.e confusion. But if there's one thing I've always noticed in media and feedback, no one really minds as long as it's enjoyable to read. Mind you that doesn't mean don't fix them, there's always room for improvement, but I've read things with very simple art styles that get so popular because it's funny or grabs my attention.
Clarity and enjoyableness. As long as you have those two, it's easier said than done, but as long as you do you will always gain a good audience. Try having those at the top of your priority next time.
Step one: go to your Dashboard, click on the Series-tab, and then on the little pencil-button next to your series (marked in red circles here, examples from my own Dashboard view:)
Then scroll down until you reach this part: 
I've already got a thumbnail, but if you don't, the box will be empty and you will be able to click on it to upload an image from your computer, as long as it's 300x300 pixels!
As for how to make it cool.... Well, look at the thumbnails of series you like, and try to figure out what about them you think is cool, and then do something like it! Lots of people put the faces of characters in their thumbnails!
Oh I do that all the time
Its only on webtoons I don't do that cuz my comic files no matter how i edit is larger than the size limit so i use my comics banner
Do people find you take a hit if you take a break to catch up and try and do more detailed, quality work?
We took a longer break after our first story arc, but now have content loaded up until September. I worry though that following our second arc if we take a break, then we will also lose folks.
I've loaded up design content, but will that frustrate folks looking for more story content? is it better not to update than to update with some "bonus" material?
Zip Kramer - Saviour of the Cosmos5
I'm finding it kinda hard to get subs too... There are people reading the pages, but I suppose the slow nature of my storytelling may not be that attractive in the beginning, oh well...
here too 
but I'm hoping mine will improve soon as I have a feature with best web comics coming up.
I know the problem with Talesfromswipecity4 is that it has physical punishment in it and lots of people
can't get past that, but it has such a lot more going for it.
I think it has to do with advertising all over the place and updating frequently, that and as they said above thumbnails. I've only started about a month of updating and I can't update but every two weeks. So I actually understand why I can't get subscribers that and I actually have my comic all over the place ironicly as much as a lot of people don't like posting to tumblr a lot of my fans come from there or smack Jeeves but I've been updating for over 2 years there and it's no where near as high as a lot of people on taptastic have over 1.5k subscribers so it can be a bit heart breaking to see others have so many.
But all in all I say not to give up. don't stop doing what you love even for the few that subscribe remember to also do it because you have something you want to share to the world and if you love your story the. Don't stop and always share there always bound to be people that will love seeing and reading your work.
