Find opportunities for your child to play their instruments with other musicians.
Music was never intended to be enjoyed in a vacuum. As beginners learn, they’ll find the support and encouragement of fellow musicians invaluable. Once they visit an ensemble, orchestra or jam session which plays on their level or just above, they’ll see a world of difference in their playing.
For the young musician, a calendar with a sticker reward chart shows a visual form of success. After a certain number of stickers the child receives some type of reward
Give the child a break!
The desire to improve needs to come from the child and can’t be forced. The best thing a parent can do to be supportive is to relax, support the child the best they can and let the private teacher set the expectations and ground rules. If you try to force them to practise, the extra stress will only discourage them.