Congratulations on getting Yelan in Genshin Impact! Yelan, also known as Yanfei, is a Pyro catalyst user with high burst damage potential. Here are some recommendations for building her:

Artifacts:
Crimson Witch of Flames: This artifact set is ideal for Yanfei as it boosts Pyro damage and increases her Vaporize and Melt damage, which are her main sources of damage. Aim for a 4-piece set for maximum benefit.
Wanderer's Troupe: This artifact set can also be a good option for Yanfei, as it boosts her charged attack damage, which is one of her main sources of damage. Aim for a 4-piece set for maximum benefit.
Weapon:
Staff of Homa: This is Yanfei's signature weapon and is considered one of the best weapons for her. It increases her crit damage and provides an ATK bonus based on max HP when her HP is less than or equal to 50%, which complements her burst damage playstyle.
Solar Pearl: This is another good option for Yanfei as it increases her crit damage and boosts her elemental skill and elemental burst damage.
Team Composition:
Yanfei works well in a Pyro-focused team as she can trigger elemental reactions like Vaporize and Melt for high damage. You can pair her with other Pyro characters like Diluc, Klee, or Xiangling for elemental resonance and to trigger elemental reactions.
You can also pair Yanfei with characters that can apply Hydro or Cryo status to enemies, such as Mona or Chongyun, respectively, to trigger Vaporize or Melt reactions, which can significantly boost Yanfei's damage output.
In terms of gameplay, focus on using Yanfei's charged attack (Hold) to maximize her damage output, as it deals heavy Pyro damage and has a chance to refund stamina. Use her elemental skill (Signed Edict) to apply Pyro status to enemies and boost her energy recharge for more frequent elemental bursts (Done Deal). Her elemental burst (Blazing Eye) is a powerful AoE Pyro damage skill that also provides an energy boost when hitting enemies, allowing her to chain bursts for sustained damage.

Remember to level up Yanfei's talents, especially her elemental skill and elemental burst, to increase her damage potential. Additionally, prioritize crit rate and crit damage substats on her artifacts, and consider using a Pyro damage bonus goblet artifact for additional damage.

Overall, building Yanfei with a Pyro-focused team, equipping her with appropriate artifacts and weapons, and maximizing her talents will help you unleash her full damage potential in Genshin Impact!
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