Harry Potter: The Idle Wizard

Albert never aspired to greatness, content to drift through life like a carefree "salted fish." Reborn into a new world with a magical interface as his cheat, he was poised to live a charmed, effortless life. Just as he settled into his plans for a lazy yet prosperous future, an owl swooped in with a Hogwarts invitation, revealing his new reality: the Harry Potter universe. Now, Albert must navigate a world of magic, blending his laid-back nature with the power of his system to carve out a dreamy, unambitious path to success. — Description from novelcodex.org