Think about the decisions that reached you this week. Which ones needed your judgement, and which ones reached you because nobody else had clear responsibility?
A price question, a scheduling change or a routine customer issue can reveal a gap in the way work is organised.
Choose one recurring decision. Identify who should make it, what information they need and the limits within which they can act. Make the escalation point clear.
Try the arrangement on a small piece of work and review what happened. A written process is only useful when people can follow it in practice.
Reducing dependence on the owner is a gradual process. Start with one decision that can be handled more reliably, then use what you learn to improve the next.