You only have eleven episodes, your last one was posted over a month ago and isn't a comic episode, it's somebody else's drawing of a mermaid. You haven't posted an update with actual comic panels that tell a story since April.
If you want to build a following with a comic that people read, you have to make a comic. You have to consistently upload comic pages or episodes that tell a story.
Make a cover with your title on it in a nice, clear, but decorative font, with an image that shows the characters in a way that hints at what the comic is about.
Then pick a story, and start regularly making and uploading pages or episodes that tell that story. Stop stopping your story all the time to change the story you're telling, or to post random bits of art and things. People can't get invested in the characters or situation if you keep changing the comic they're reading to be a different story, or not a story at all!
All I did to get 100 subs was to keep making pages, a couple a week, without interruptions like random artwork. I picked Tapas because I could see comics that mix Fantasy with relationship drama and especially showcasing authentic LGBTQ+ experiences doing well here. I designed a nice title font (this was before Tapas comics had covers. They just had thumbnails and a banner back then), and I planned out a story starting with a sympathetic protagonist in an interesting scenario that creates tension due to potential opportunity, drama and danger. I made pages to as consistent a style and quality as I could, uploaded them, then I posted about it on the forums and social media.
