Hi!
You should motivate your son with something that he likes. If he’s interested in technology (cars, trucks etc.), you should show him a firehouse during open house for example. My husband is a volunteer firefighter. Sometimes he shows our 8 years old son the station, when they perform maintenance work. If he learns a musical instrument, but he doesn’t like the compositions, you should motivate him with a mixture of pop/rock/classical music. Here are some links. Maybe they motivate your son.
All the best,
Samantha