I don't know if they are considered underrated but here is a couple of my favourites:
Graceling by Kristin Cashore
Fire by Kristin Cashore
The Study series by Maria V Snyder
The Healer series by Maria V Snyder
i don't but i do suggest The emperor's soul by Branden Sanderson, its a quick read but very very good. good intro into his stuff then just read more books by him and be happy in good creative worlds, or start Steven Erikson's Malazan book of the fallen series and forget happy but damn its good.
I would say the first two have more simple world building and focus on the romance aspect but Chaos of Storm and Shows is more fantasy focused where romance becomes a bigger part within book 2 & 3
Parallel by Elle O'Roark was really good, more heavy on romance vs fantasy. Ingrid Seymour has a series that starts with A Prince so Cruel that was good
Where the Dark Stands Still by AB Poranek. It's like an easy dreamy read, author is a huge fan of howls moving castle and I think it became my fav book of this year tbh💕
Paranormal Romance - Guild Codex Spellbound by Annette Marie
Urban Fantasy - Amber Farrell series by Mark Henwick
Fantasy - Strange the Dreamer by Laini Taylor
Comments
Graceling by Kristin Cashore
Fire by Kristin Cashore
The Study series by Maria V Snyder
The Healer series by Maria V Snyder
I vaguely remember this being good!
Urban Fantasy - Amber Farrell series by Mark Henwick
Fantasy - Strange the Dreamer by Laini Taylor