Do you have any employees now? I think you need to first sit down and begin to write some sort of business plan. It does not have to be a perfect plan, but something that outlines your present position and where you want to go. Take from me, in 1991 after being in business for 11 years I was nearly broke. Why? I built and business around ME and the busier it got, the worse it got for me. Busy is supposed to be a good thing, but when you are doing everything yourself, as you describe, it will only lead to trouble.
Your problem cannot be solved easily. It will take time. You need to start hiring people. Find out what a decent pay scale is for your area. Take it slow, but do it.
Here’s what I did back in 1991 when I could not work any harder anymore: I outlined on paper all the job titles I held; tech, shop forum, service advisor, bookkeeper, janitor, etc. And, one by one I replaced what I was doing with an employee. I started with a booker keeper, then another tech, then a few more techs, a cleanup crew and finally I hired a few service advisors. I gave myself a 5-year plan to accomplish this. Once I put the plan into motion, my business grew and grew it keeps growing today because I cultivate people around me, good people to help me succeed.
I hoped I helped you. I may have given you too much at one time, but you sound like you need the help. Good luck, keep in touch.