I guess I see your situation as a challenge, not so much a problem.....or, at the very least, you have 'a good problem'. You said you have more work than you can handle. That's wayyyyy better than not having enough work.
Maybe an apples to oranges comparison, but when I started my business 10 years ago, I offered installation of both non-illuminated and illuminated signs (using a friend's license), preliminary and technical surveys, providing (through vendors) vinyl graphics, dimensional letters, fabricated signs, etc. That variety of offerings kept me going those first few years. But it got to the point that I was buried and recognized the need to streamline. Installs took the majority of my time and were the most profitable, so I gradually eliminated other items. First, I stopped offering any installation of illuminated signs. Still too busy, I next eliminated offering vendor-provided signs. Still too busy, I've started declining most survey jobs, especially the ones that I won't be installing (ie: surveys for channel letter installs, pylons, etc.). I now, almost exclusively, install signs & graphics provided by other sign companies. Installing keeps me pretty busy, then there's invoicing, quoting, taxes, financials, keeping the van and garage/shop organized, etc.
I try to recognize my limitations. I have a wife and family I need to be available for. I value my time with friends. I enjoy working on my property. I feel it's important to have a 'reset' from the stresses of life. For me, that's travel, so I make time for that. Balance in life is key.....I was going to say 'in my opinion', but I think that's a fact.
I'm a one-man-show. I liken it to guerrilla warfare. Small and mobile with a very specific skill set. If you have too much work, streamline. Find your niche.