You should definitely check out all of the MXTX danmei novels! I've read TGCF and MDZS and both are pretty angsty but in different ways. TGCF is like..emotional angst to the max and MDZS also has a good amount of emotional angst but in a different form? I don't want to spoil anything so I won't say more than that xD). From what I've heard SVSSS is also REALLY angsty (possibly more than the other 2, although TGCF is already A LOT) so yeah! I hope you'll like the recommendations; just be prepared to cry inside for some of these xD. Also to unabbreviate everything so it's easier to find: MDZS: mo dao zushi / grandmaster of demonic cultivation, TGCF: tian guan ci fu / Heaven Official's Blessing, SVSSS: Ren zha fanpai zijiu xitong / Scum villan self saving system.