Good place for a fantasy fan.  I'm not 100% certain what the difference between modern fantasy and fantasy is.  I'd assume modern fantasy is a little more grim and a little less magic-y, but maybe not.

Suggestions of folks to look at,

JB - mostly Warhammer RPs, sometimes 40k (SciFi) and sometimes Fantasy
Poohead - mostly Elder Scrolls RPs, almost always hs at least one going

Sometimes TGM or Selune/BCTheEntity do Fantasy RPs as well, although often they do SciFi

I tend to stick to Advanced, which is where those people I just listed mostly write, but there's some good stuff in the Casual section too.

Letter Bee has an Interest Check out for a Game of Thrones RP.
I've got a Bannerlord RP (fictional world medieval setting)

There's also one from Lord Wraith set in the Redwall setting.  Sort of medieval fantasy but with mice and rats and shrews and moles and stuff instead of people.  I'm not in it but I'm steady monitoring it.  Soft spot for cute little animals with swords and shields and stuff.

https://www.roleplayerguild.com/topics/187517-the-yurazen-prince-a-tale-of-redwall/ic

Anyway Welcome!

It's a pretty solid RP space.  It can take awhile to find your niche but it's a big place and a solid format.