Not sure how it will play out. Your plot seems something a japanese audience or anime/manga fans would like.
I love both influences japanese and korean. I am not a fan of many chinese manhua mainly because of the style they write in but I do follow like 2 or 3 manhua.
In your shoes I would post in multiple sites my novel. While tapas is good for novels they have a specific audience so it can become a super hit or just another novel.
As for what @Kaisei about romance comics having wars, plague, black magic, etc. That's a very korean style work influence. Western romance focuses more on regular everyday romance and some problems here and there but in korean works they use lots of drama and fantasy/historical scenarios to express the romance. While it does portray romance it is not the main focus of the story.
It is not what drives the plot.
In fact, romance only gets stronger by these scenarios without them the romance wouldn't even had started.
At least, that's how most manhwa work. The perfect example is Royal Chef or Raftalia.
Another great example is "When the Villaines loves".
Now like I mentioned before the main attraction point of tapas and why it is not as famous as lets say webtoons is because their main works are all korean while webtoons started with korean works but moved to western comic influence. So webtoons is a combination of both.
Who knows maybe tapas will evolve one day to include all types of audience but until then we have to adapt and share our work on multiple sites plus self promote.
Promotion of your work is 90% of the work while writing is just 10%.
EDIT---
There was also a mention of overpowered MC in fantasy.
That will happen a lot be it manhwa or manga. But usually manga makes them way more overpowered while manhwa is overpowered but MC gets stronger over time.
Lets say you fought the second boss first your character would of probably lost. On manga they are just stupidly op from the start even if their skills are "trash" as their tittles describe it.