Greetings Sienna, we are all trying to figure out these things ourselves. Nobody has cracked the perfect formula for success on Tapas yet. There are a few things that you can do, but opinions and experience vary on their relative effectiveness. Picking the next hot subject matter and effective use of series tags can help. Some users swear by regular update schedules. Cross-promotions with other creators are popular but a little controversial. I personally believe in a good summary and good cover art.
things to NOT do:
By the way, the tags placed on episodes currently do nothing, so don't stress about those. Just recently, some titles got removed from the search function (only on the Apple iOS app) because of content issues; if that happens to you, Tapas will send you an email about it. Don't ignore those emails. Don't spam the forums with ten self-promotion posts in a row, because nobody is going to scroll past the first nine and suddenly get drawn in by the tenth. Don't forget to have fun.