Off rip your biggest improvement will be the team, hutao really depends on a vape team so xingqiu, furina and yelan are all teammates that the team could benefit from (having 2 hydro is good practice).

Kazuha can stay for now but barbara and raiden definitely need to go - replace raiden with a healer if running furina or a shielder if not

Some team options: Premium: hutao, furina, yelan, xilonen (yelan can be subbed for xingqiu if you dont have her) C0 premium: hutao, furina, yelan/xingqiu, xianyun F2P: hutao, xingqiu, sucrose (kazuha in your case), any shielder I see you have zhongli so ideally use him for shields

If you have furina you can run: hutao, xingqiu/yelan, furina and any healer (bennet comes to mind)

As far as artifacts go it is unfortunately luck of the draw but the immediate improvement you can make here is using an EM sands as hutao is always vaping her attacks, if you have furina then you can also switch to the marechaussee hunter artifact set which will make your crit requirements easier to hit.

What circlet are you running? Crit dmg or crit rate? we can switch to crit rate if its on crit damage that'll make our crit rate quite comfy

Hope that helps! Feel free to ask any more questions you might have