You think you can do it all on your own; but, the truth is, the business will only grow as far as you're willing to grow. Left to your own devices, you can't reach your full potential on your own. Reaching your full potential (which is a moving target you will never hit) involves extreme growth and breaking out of your comfort zone.
You can do that on your own to a point; but, eventually it will get so difficult, you will naturally start to let up on the gas.
One of our brain's jobs is to protect us. So, no matter what you do, complacency is almost unavoidable.
Unless you have a great team around you to kick you in the ass.