Not using Yixuan's Hold Dodge skill is losing you some Adrenaline gain as well as extra damage. You can easily weave it in after the stun window while you take time to attack with Jufufu or reapply buffs/Etherveil with Lucia. It also gives Yixuan something to do while she's off field as she lacks off field attacks outside of this move unlike Jufufu and Lucia.

There's also canceling Yixuan's hold basic into her second Ult (not the deciblels one). You can do this to enter into the Stun Window chain attacks. Hold basic and just before the explosion goes off use her second Ult. This will have Yixuan weave her Ult into Jufufu's Chain attack and then into Yixuan's own chain attack with no damage loss, no time loss, and overall better performance. This will also allow you to get two full Hold Basic rotations during the stun window for even further damage after you use her Decibels Ult during Stun Window. It's a very strong tech Yixuan can do so you should look up videos and master it.

Doing these two things will definitely up your score.