As a freelancer, you are the product. Clients buy your knowledge, your execution, and your presence. You deliver the work.
As an agency owner, you are the system that delivers. Clients buy the result, not the person who creates it. That means you select, train, guide, and let people go, while the quality of the work does not depend on whether you are personally involved.
That sounds simple. But it is not. Because the transition requires something from your identity, not only from your organizational structure. As long as you tie your value to doing the work yourself, you will find it difficult to let go of execution. And if that does not change, employees will keep waiting for your input instead of making decisions themselves.
Chris built RockBoost from a small agency into a team of 85 people before selling it. What he learned during that time was that the technical growth steps are easier than the personal ones. You can build systems, document processes, and hire people. But if you are still standing in the middle of everything as the decision-maker for every issue, the structure is an illusion.