I'm already following your comic, and I don't see you doing this with that comic, but just in case... Don't make the mistake of putting the entirety of a single chapter into each episode. The term "episode" on this site is rather misleading for us longform creators. It's really hard to read 10+ pages stacked on top of each other, unless the entire chapter was drawn to be read in that specific format.
The universal basics apply: engage with your readers and reply to comments, don't be afraid to comment on other people's comics when you have something positive to say, etc etc.
One thing specific about Tapastic is the ability to post on other people's profiles. Some creators choose to post a thank you image on their subscribers' profiles. Some readers love them, some don't care; either way, it's a positive gesture, AND an acceptable way of subtly advertising your comic. Put your art in the thank you image, and when other people visit that person's profile, they might go "hm, who's this character? I wanna check out their comic."