hiii ! i'm so sorry that we're both leaving ;-; but i do have suggestions yes! there are some very great sunsunists here!

kungyasun is a very dedicated sunsunist who also translates for them. they also like sunsun a lot individually! icebreakersunoo also translates and loves sunsun but i don't think they're rps. in the same vein, there's sunsunlovebot. she's not active anymore i think but her media tab is great for seeing a sort of archive of sunsun. kungyazfilms and sunsungallery are still active! there's sunskittle, uswerunknown, illicitsuns, sunsunlatte, hunsunist (korean sunsunist), lovingsunsun and also sunsunwonistt that immediately came to mind! they're all rps and pretty active sunsunists. hoonsuun is not as active but i think you might like their media tab too + they're sunsun focused only i think. 021208x030624 also functions as a good archive but they're ia now

there are also some ao3 sunsun writers on twitter or other accounts in general that you can follow. they occasionally tweet or talk or write about sunsun! wonbaozi, 2SUN_Station (also rts other sunoo ships sometimes), lovingsvn (not a writer but i thought i'd mention because i've only ever seen her like sunsun. she might get nsfw at times though! because idk if you'll be comfortable with nsfw accounts), lethalksn (nsfw writer and usually semi ia), highlikethemoon (not very strictly rps but a very observant sunsunist and loves sunsun individually a lot too), st4rrynoo (also likes zb1), mintchoctea (mostly talks about writing), sunsunspearl (occasionally nsfw, likes other sun and hoon ships too), sunwnist (almost exclusively likes sunsun), gatomaquia, jimjimcherie, attyhoon, kungyazel, f3ll4enha (sunsun monogamist), fortunamajor__ (two underscores), ponyohoon (more of a multishipper but her sunsun fics are amazing) and EnhaSunSun_

bonus: incorrectsnsn!