(Seems like we have different tastes so take my recs with a grain of salt :))
Check out Together With Me and TharnType. They are not as good as Sotus (imo) but both are set in university and actors have amazing chemistry (story is not that good in both of them). Please note that Tharntype has also some problematic themes (fails to address problematic themes). Both dramas are quite steamy.
Try also Dark Blue Kiss - i find it a little boring (and so far i've only seen few eps) but second couple seems interesting.
Currently airing Until We Meet Again is really amazing so far (though absolutely different vibe from sotus. it is very soft and intense).
Consider finishing LBC because it is getting season 2 that is focused on TinCan couple :)
One more rec: Theory of Love. I am hate-watching the drama but production is amazing. The story is completely what the synopsis suggests.
Taiwanese HIStory series is also quite popular (but i havent seen any installment yet so i dont know which to rec)
Check out these lists to see what people consider the best thai BLs or best BL in general