After the Blood Test Proved Our Kinship, I Sold My Husband

Earth-Based High Martial Arts + Rampaging Monsters + Lighthearted Vibes

I've suddenly been in the mood for novels about Earth developing high-level martial arts. The ones that come to mind are One Punch to Annihilate a Star and My Attributes Have No Limits. Could you help me find more? Something lighthearted, preferably with a System, though that's not a must. As long as the romance doesn't fall apart, I'm good. No saintly protagonists, please.