Replacement motor for x axis

Left side x axis motor stopped working a few days ago. Took me a bit to troubleshoot it but pretty sure it’s the motor and not any wiring issues. I am requesting input on a replacement motor due to the fact it is not clear on this website which motor should be used. Also suggestions on upgrades would be greatly appreciated.

If your budget allows for nema 23’s, go big. More torque is better.