The Heavenly Serpent: Rise of the Cheat Potion Maker 5

Strong MC in a slice of life environment, dungeon diving, boss battles, cultivation and elements, mana/magic, mc exclusive system but it doesn't do the work for him, treasures, adventurers, slow world building, build-up, features that will not be introduced all at once (upgrades so on), actual good loot at the end of very powerful bosses, romance(no harem). As characters develop throughout the series, issues and emotions and even the mc may find himself in a corner or two. A story of an upcoming potion shopkeeper and his apprentices.