I’m not sure such a thing exists but I want a Xianxia or Xuanhuan protagonist who is pursuing the dao of Alchemy and not the dao of face-slapping every young master he comes across with the super technique he is mastering called The Super Dragon Destruction of the Nine Worlds.
hmmm. . . . so the skill "The Super Dragon Destruction of the Nine Worlds." is no go huh. . . then how about "Demon Sealing Hex?" how about this one? is it no good? I Shall Seal the Heavens?
A Will Eternal and I Shall Seal the Heavens fit. The others, unfortunately, generally make the Dao of Alchemy an entry Dao to the Heavenly Dao of Face-slapping Every Young Master He Comes Across With the Super Technique He is Mastering Called The Super Dragon Destruction of the Nine Worlds. AKA the Power Trip Dao of Plot Armor
now that i think about it Ji Ning (from DE) has never try the dao of alchemy, he has the knowledge but he hasn't practiced it.
You see it in many novels. Protagonists are a jack of all trades. It gets boring fast and the author forgets about it I recommend Overgeared, at least it was the focus
Main Character Hides His Strength doesn't have anything to do with the Dao, as it's a Korean Novel, but the MC still uses alchemy quite a bit.
Alchemy Emperor of the Divine Dao It's from Qidan though don't know if you will like it but it's a good read