Similar to the Hydro character Kokomi, Baizhu has a lot of 4-Star and even 3-Star weapons that work great for him with the main stat of HP. You'll want to give him anything that will assist his healing for the team. Here are some of our recommended weapons.
5-Star Weapon: Jadefall's Splendor
Jadefall's Splendor will give Baizhu a base increase of 10.8 percent to his HP. Its Bonus Skill will allow Baizhu to gain the Primordial Jade Regalia effect for 3 seconds after using his Elemental Burst or creating a shield. This effect will: Restore 4.5 Energy every 2.5 seconds and gain 0.3 percent Elemental DMG Bonus for their corresponding Elemental Type for every 1,000 Max HP they possess, up to 12 percent. Primordial Jade Regalia will still take effect even if Baizhu is not on the field. Jadefall's Splendor is Baizhu's signature weapon, so if you have successfully pulled for this weapon, we highly recommend it. It will be a great way to make his healing as strong as possible, as well as restore his energy.
If you want to quickly get the desired 5-star character, you can buy Genshin Impact accounts on MMOWTS.
4-Star & 3-Star Weapons: Prototype Amber, Favonius Codex, Thrilling Tales Of Dragon Slayers
Prototype Amber will give Baizhu a base increase of 9 percent to his HP. Its Bonus Skill will regenerate 4 Energy every 2 seconds for 6 seconds after using Baizhu's Elemental Burst. Additionally, all party members will regenerate 4 percent HP every 2 seconds for this duration. Prototype Amber is the best Free-to-Play choice for Baizhu and will provide additional healing for the team. It will also regenerate his Energy, similar to Jadefall's Splendor.
Favonius Codex will give Baizhu a base increase of 10 percent to his Energy Recharge. Its Bonus Skill will allow CRIT Hits to have a 60 percent chance to generate a small amount of Elemental Particles, which will regenerate 6 Energy for Baizhu. This can only occur once every 12 seconds. If you weren't able to build up Baizhu's Energy Recharge in his artifact build, then Favonius Codex will be a solid option to make sure his Elemental Burst is often available.
Thrilling Tales of Dragon Slayers will give Baizhu a base increase of 7.7 percent to his HP. Its Bonus Skill, when switching characters, will allow the new character taking the field to have their ATK increased by 24 percent for 10 seconds. This effect can only occur once every 20 seconds. Thrilling Tales of Dragon Slayers is a 3-Star weapon, so you are almost guaranteed to have this one in your arsenal. Since it is a 3-Star weapon, you'll be able to easily ascend and refine it to increase the ATK buff it provides for your teammates.
If you want to learn more about Genshin Impact, MMOWTS.com is here and it offers genshin impact accounts for sale.