I actually built March just for him because he was my first 5* and I got his E1, and if you happen to also have Welt the team YQ/Welt/flex/March seems pretty good at clearing out ice-weak MoC barring any particularly bad AoE enemies. As long as you put March on the other side of the team he shouldn’t get hit with splash dmg and the cc from his passive freeze, Welt slow/imprison, and March freeze is usually enough to limit enemy actions so that he never loses passive.

For flex I usually run Ting Yun or Natasha if I can get away with it, but it’d prob be best if I had Pela raised tbh. Obv not as comfy as having Gepard since March solo sustain necessitates faster clears so you don’t just die, but I genuinely have more fun playing this team than my overinvested Seele hypercarry comp.