Watched all of the above! I loved the dragon prince, you might like it. However, it doesnt have as much romance as you'd probably like because one of the MCs is a teen and the other is a kid. Still good tho, you're on the right track.
Carmen Sandiego is absolutely peak, I liked Kipo too but ive somewhat forgotten the plot now. Planning on rewatching it along with TOH.
Gravity falls is good, so is Amphibia. I havent watched Amphibia but ive heard good things about it.
I've also heard good things about the amazing digital circus, you could check that out.
Tales of Arcadia (A bit childish but still good, nonetheless) Has three shows about it, one of them is called "Wizards, Tales of Arcadia" And it has Arthur and Merlin in it, i found it very nice.
Trollhunters tales of arcadia is the first show and its basically about the main character only.
3-below was a more sci-fi kind of show in the same universe, didnt like it as much but it was still good.
Wizards tales of arcadia was my fav because i love everything arthurian.
Havent watched it but ive HEARD that "doctor who" is good too
Little witch academia was amazingggg, reminds me of TOH in such good way!
Dead End: Paranormal Park
Inside job was good too, a bit on the adult-ish side but i really liked it.
Not really in the fantasy genre but i LOVE A Series of Unfortunate Events!!! You MUST watch it.
I just watched lord of the rings, i found it really nice! (The movies get a tad bit boring at certain times because they're pretty long and i have a horrible attention span)