Useless? I Sweep Through the City with an Immortal Emperor's Memories

I’ve returned reborn from the cultivation world. I know a little about martial arts, medicine, and mystic arts. That’s not too much to ask, is it? [Heads-up] The protagonist only returned after his soul transmigrated from the cultivation world. He’s lost all his cultivation, so he’s not some mindless powerhouse who can destroy planets with a wave of his hand. Relying on his memories of the cultivation world, he crushes the competition with a higher-dimensional advantage and rises to the top once more!