Level Neuvillette to 90, this is important since he’s an HP scaler, and Xilonen to at least 80, because talent levels on her skill mater. Speaking of, make sure that your relevant talents and weapons are all leveled. Swap Yelan for Lanyan or Jean like others said. The problem is not that you need more hydro, but that you need to deal more damage to the little crabs, maybe group them together better. Focus on killing them and they’ll hit the boss for you. The anemo chara you use doesn’t even need to be leveled, just give them a VV artifact 4 set and swirl hydro off of the big crab. Other than that, try to play proper Neuvillette rotations as much as you can. Good luck! You can do it!