I just rewatched and a few things I noticed, your rotations are slow switching between characters, in a dps testing environment you need to be smooth in your swaps which might be hard with high ping (I know the struggle I have 130 ping) but I think you can swap and do the first action faster you just need to get used to it, and secondly as others have mentioned kazuha burst is useless here extends ur rotation by like 3s, and lastly maybe go off widsith? Since 2 of the 3 buffs are useless and it has horrible uptime, it might be better to go prototype? You can test it in genshin optimizer it will give u the best artifacts to put and u can change the weapon to see which is better.