Being needed gives kids a healthy sense of significance and purpose. Give them jobs that if not done will result in consequences for other people. As much as possible, set up systems and structures that truly depend on the child's participation. Train your childe that we're blessed to be a blessing.
Sometimes saying NO! can be a blessing. Allowing your child to sit in their mistakes and expecting them to take responsibility for what they have created is an opportunity for growth. We have become a society that doesn't want our children to "feel Bad" but in doing so we have robbed them of all their lessons!