Short answer
Build a team that can decide, disagree and carry out decisions without you in every conversation. That means hiring or developing leaders who think beyond their own function, giving them clear decision rights and shared goals, and coaching them as a team, not only as individuals. Then develop the next layer down, so the team has people ready to step up as the business grows.
The longer answer
Many growing companies have a group of strong department heads, not a leadership team. Each runs their area well. Together, they wait for the CEO to decide.
The shift is from “my department” to “our business.” It shows up in small ways: leaders who raise problems in other areas, who give up budget when it helps the whole and who settle disagreements without escalating them. Those habits can be coached.