Ok to cure the shopkeeper you need to do the spectral syrup and have it in your inventory not just the heat occissia since the heat occissia is an ingredient of the spectral syrup, the bandits camp only unlocks after they attack Bareshade and you talk with the Lumberjack about it's location, but the attack only happens after the shopkeeper is cured if I'm not mistaken, it also only happens if you know the lumberjack.
Also there is a limitation on the content but that is because the game is a WIP and is way way forward from where you are you're still in the early stages of it.