The most powerful martial artist becomes a sorcerer in his new life

30 years of my life's work just for this? I was determined to be the strongest in the world, I was only in a body that couldn't use magic, but I still believed that I would be the strongest, I was confident in my overwhelming martial arts, so why did I lose to a sorcerer, I mean, it was impossible for me to be the strongest in the world, so I wish... If I had the gift of magic, then things would have been different