You could more than afford a project manager buddy. It sounds like you need one.
You have a successful highly profitable business, reputation and business model - primed for growth.
Get a PM to manage all the bullshit, do some of your estimates etc and focus on growing the shit out of it. In five years you could be answering the phone on a fishing trip in Alaska while your minions do all the work.
Don’t abandon ship!
Are you selling a somewhat commonly existing/sold product or something that you patented or branded?