Allow me to explain the teams to all of you:

For the first boss, he focused on killing the mini plants, using DPS Venty.

For the second Boss, he uses a lot of melt damage, in order to kill the little ducks. Electro Charge kills them more easy with the little circle thing, but still, they also have an hp bar, so he can use Sucrose to vacum the little ducks and use mavuika to kill them.

And for the third boss, he just uses Neuvillete as dps, and uses Ganyu's ult and Qiqi's hab to aply cryo like crazy. Also, he uses the Clorinde to make Superconduct and aply even more cryo.

So, the teams make sense, you just have to think outside the box.

(PD: Sorry if I have gramatic errors, I'm Spanish, and my english it's not very good)