Keep commitments small enough to honor and important enough to mean something.

Commitments that are too large fail, and failing teaches everyone including you that your word is provisional. Commitments that are too small are always kept and mean nothing. The useful range is where you can reliably deliver and where the delivery actually matters to someone.

When you next commit, shrink it until you are certain you can do it, then check that it still helps. That combination is what builds a reputation worth having.