Seeking Advice On Upgrading Carrera RC Cars

I recently purchased the Mario Carrera RC Mario Kart Mach 8 Mario and Peach Carrera RC Mario Kart Pipe Kart Peach RC cars from Carrera for my girlfriend and me. We love how cute they are and enjoy racing them, but they are really slow—especially the Peach one. I'm new to the RC hobby and far from an expert. From what I've seen online, I think I need a brushless motor and a compatible battery to make them faster. I'm seeking advice on how to speed these up, or if anyone here offers such services, I'd be interested in paying for help. Thank you and have a great day!