Thank you very much.
I made the rear axle directional (temporarily) and with a servo already had address:

https://youtu.be/7CcQHTlhg3s

Another improvement I made is the wheels. It greatly improves its appearance:



This video shows the construction of the wheels:

I still make improvements such as a 2-speed gearbox or a differential like this I did:

https://youtu.be/i8tCAgIOn9A