The manga you're lookinlooking for is called The Reincarnated Inferior Magic Swordsman, in case you never found the answer.
Tohru Minasuki, a normal office worker, is reborn in another world after falling through a dimensional rift. A god grants him an ability called Skill Board upon his reincarnation. Taking advantage of this, he acquires essential skills-and an overpowered skill called Magic Blade. Despite his status as a stray-those known as inferiors for being seemingly incapable of leveling up-he presses forward on the path to becoming the strongest!
