Just as a warning, with a thread title like "Get more subscriptions" You're probably going to get a lot of people thinking it's a promo thread, dumping their links and running. 
Anyway, as asked, advice on building a fanbase:
- Make sure your episodes/chapters/updates/pages all have something exciting, or a plot reveal or a joke or something sexy or cute that readers can comment on. Upates that feel like filler or filling in between space don't invite interaction.
- Reply to comments and be friendly with your readers.
- Do banner swaps and shout-outs with other creators in the same genre or feature other people's characters as cameos (with permission) to build a sense of community.
- Between books, chapters or major storybeats, include some extras that either have fun with the characters, showcase fan content or feature behind the scenes or worldbuilding info.
- Have a consistent look and tone in the sorts of colours, fonts, logo and imagery you use to give your series a consistent "brand identity".
And now, some directed advice:
@Vikar
You already know an illustrated cover in a manga or manhwa style would help you out, because I've seen you asking around about one (your current cover would probably do great on Radish though).
Try to make your blurb describe what the story is about more clearly. People on Tapas will respond way more to the fact that it's about a guy who gets isekai'd into the role of the hot teenage elf boy protag of his own unfinished fantasy novel, than to existential questions. If you make your blurb too vague, it puts readers off, because it so often flags that the creator doesn't know what they're doing and they're just making stuff up as they go, or they don't really know what their story is about.
@aprilferrero
Your art is extremely well-drawn, but your cover is too detailed and doesn't use contrast to make the figures pop from the backgrounds enough at the teeny-tiny size covers are displayed on Tapas. It's a very clever cover when seen at a larger size, but it's not doing it's job on the site or app, so consider making a simpler cover that illustrates just the most basic, high-level concept of the story, characters and vibe.
Also I think Drama isn't the ideal first category for this story (only your first category actually matters, that's where you'll be displayed and ranked. The other two are just cosmetic) and I think it'd get more readers in Mystery, Sci-Fi or Horror.
@ImamHasan
Get somebody to help proofread and edit your blurb. It contains a number of grammatical errors that make it a bit hard to understand, and could probably be shorter and punchier.
@Zinx
I'm actually stumped by this one... I have no idea how to market a book of poems with stock photos and illustrations in the comics section... err... A punchier, more high contrast cover with a brighter logo would probably help? I think you'll need to advertise off-site to find the poetry fans... maybe lean into that "Dark Academia" vibe?
