I've heard many good things about (but haven't yet read) "Bitterthorn" and "Legends and Lattes" (not exactly romantasy - it's cozy fantasy with a sapphic romance). They're both more on the cozy side tho, not epic like "Priory...".
I'm reading The Unbroken currently, it's not exactly a romantasy (more just fantasy) but it's got two sapphic leads and there's political intrigue aplenty!
Princess of Dorsa by Eliza Andrews! It’s a trioligy with a duology prequel coming out. Sapphic, politics, guard and princess trope, magic… sooooo good and underrated
I’m reading jasmine throne and it is so amazing and very sapphic (you just have to get 200 pages in first). Definitely my favorite wlw romantasy yet. I also just finished the (ya) sapphic romantasy midnight girls which was fun too.
Note: possibly something with similar vibes to Priory of the Orange Tree?