Support it when requested, but give support only when requested.
Think of your child as being driven by their enthusiasm and interest. They don’t control these forces and you do t either. Trying to force them kills them. Trying to direct them suffocates them.
So, be there, celebrate what they celebrate, lend an year to their doubts, feel free to offer a bit of support but never insist on it. Watch it grow and maintain the soil; that’s all you can really do.
Compliments are also rewards by the way ;)
I highly recommend taking a look at the book, it’s in most libraries.