Due to their appreciation and expectations, I can't exploit my slaves

Story:

Allen, a reborn boy, receives a gift from a deity possessing the cheat skill "Restoration." Since there are few locations where he can fully utilize his ability to cure wounds and illnesses, he intended to "regenerate" the slaves he purchased and live a leisurely lifestyle. However, the cured slaves' deceptions proved to be so extraordinary that, in the space of a single blink, both their living conditions and the crops they cared for improved. Allen, the main character, tries to fight that with his contemporary knowledge as he is gradually robbed of opportunities to shine, but those gifted slaves absorbed it all and made any business successful. Is the protagonist losing significance every day that goes by?