What a beautiful star quilt! You've done a beautiful job!
What I like doing is considering the use of the quilt...if it's going on a wall and will only be washed infrequently, I quilt very little. If it's going on a bed and will be washed more frequently, then I quilt more. Look at it hanging on a wall, lying on a bed, consider your batting, the user, the use of the quilt, and then make your decision.
Just don't make yourself nervous over it. It's your masterpiece and you need to be happy with it.
Wonderful work, congratulations,
Sharon