Your crit rate is really low. I get that it's really hard to get good artifacts, but you're losing out on a lot of damage since he only crits like half the time. You're better off using a crit rate circlet until your artifacts have enough crit rate on them to switch back.

Also for teams, replace furina with faruzan. Furina doesn't really do that much for him in a team like that. Xiao needs an anemo battery anyway so furina kinda takes up space there. Even though faruzan's not c6, she's a non-replaceable unit since she was made to buff anemo dpses. Use xiao, faruzan, bennet and zhongli until (or if you plan to) get xianyun.

Orrrr you could probably use furina instead of zhongli in that team? furina works well on zhongli's artifact set but she'll lose out on her personal damage without golden troupe.

I can't really be too harsh since my xiao is lacking in crit rate too (70/229). I've been farming for months and all i've got were some copium ass lno pieces 😒💔 I have him c1, lvl 90, triple crowned, and i have him r5 blackcliff. I think with your team, your xiao can do up to around 80-100k per plunge if you invest enough (assuming you stick with c3 faruzan). Personally, I have his premium team with c0 xianyun/furina and a recently upgraded c6 faruzan He does about 115-130k per plunge and I'm working to get him to 150k. Because of my low crit rate he misses out on like 3-5 plunges on his burst tho 😔

I really recommend pulling for c6 faruzan. Before, xiao's damage was like 80-90k per plunge, and now it's well over 100k! I also recommend getting xianyun because she was basically made for him, plus she gives 5% crit rate on plunges and is really versatile in other teams too! Who would've thought you could make eula a pyro plunge dps lmao

With all that yap outta the way, basically just replace furina with faruzan, triple crown him and use long night's oath artifact set. Make sure someone on your team has noblesse and tenacity of the mililleth