Tapas is pretty known for comics, but as well as novels. Action Fantasy is a wide genre and competitive to stand out, but romance is definitely the most popular, in my opinion.
To be considered for an adaptation by Tapas/Kakao, you need:
-To be Premium
- Massive statistics and a big reader base. It used to be easier for premium novels back in the day to get a comic with as little as 100k views. Nowadays, you need a LOT more than that and substantial subs/likes.
- Even if you have those two things above, there's the hurtle of even getting picked up by stakeholders to invest in the story (because Tapas is now owned by another company).
Turtleme is definitely a great inspiration.
My suggestion is to create a story with a plot/cover that stands out in the sea of novels trying to reach the same goal, focus on building a loyal reader base (not sub4sub), and networking.