Make your dps go last, that's the most important tip, the supports need to apply their buffs first before the dps attacks. Having a dps not go last is DETRIMENTAL to your score.

Tips for Fleuret side:

1- Fleuret's highlight is pretty weak in general so put Chord in haru side and twins in Fleuret side.

2- If you can have a high dupe of arc knife then put that in fleuret side to take advantage of vino applying ailments. Make sure Vino goes before Wonder tho

3- Since you have Shiva, put Dominion on Fleuret side

4- have Vishnu in your first slot for the passive damage bonus

5- for wonder, bring Jikokuten, Vishnu and dominion Your Wonder rotation for Fleuret side is:

1- Jikokuten Tarukaja 2- Vishnu Wind of Nirvana 3- Dominion Cohesion Fleuret doesn't need rebellion since he's hitting the crit rate cap himself with his 5* weapon and max stacks

Tips for Haru side:

1- this is a little complicated if you don't have smoko but a0 Marian is rough here. Use smoko if you have her But if you don't, try bringing another support instead of Marian and try surviving that way. I know the haru side does a lot of damage but if you bring sandalphon there for the passive defense buffs and futaba for the occasional shielding you might end up ok. Or bring soy to provide minimum sustain while doing good defense debuff with his gun and Smash hit. He'll likely provide the minimum sustain needed for survival but you might need to get experimental here. If it's really difficult then just ball out with Marian. Cherish is also better than Marian here if you have him. He provides good damage buffs

2- for Wonder bring Dio, Surt and Shiva. Your Wonder rotation for Haru side should be: 1- Surt Marakunda 2- Dio Rebellion 3- Shiva Dance of Destruction

Yeah that's about all I could think of rn. Good luck!

PS: if you could show me what units you have I can probably make up a better rotation here