test if dryer motor is broken
Take the belt off and see what it does.

IMPE, this is usually failed drum rollers that have too much resistance to allow the motor to start. You might be able to get a sense for that by simply trying to rotate the drum (without trying to turn the motor on.) If the motor starts with the belt off, excess mechanical resistance is the problem, not something electrical.

Last time it happened to me I did a "kit" rebuild - kit was $25, rollers alone were $19 - kit included both rollers, the belt and the tension roller. I tucked the old, worn but intact belt in the dryer in case of future need for it (and wrote myself or whoever sees it a note on the inside of the top of the dryer.)