Final answer:
To make Xiao deal more damage, optimize his artifacts, level up his talents, use appropriate weapons, and consider team composition for synergy and elemental reactions.
Step-by-step explanation:
To increase the damage output of Xiao in the game, you need to focus on optimizing his artifact stats, weapon choice, and talent levels. Artifacts with Attack%, Crit Rate, and Crit Damage are ideal. Anemo damage bonus and Energy Recharge can further enhance his abilities. Leveling up his talents, especially his Elemental Skill and Elemental Burst, increases his overall damage. Using a weapon that boosts Crit Rate or Crit Damage, such as the Primordial Jade Winged-Spear, enhances his capabilities even more. Additionally, ensuring synergy with your team composition and elemental reactions can maximize Xiao's damage output in combat situations.