It seems there is an opportunity here to "manage and tidy up" the bigger projects without getting that closely involved yourself.
Say for example customer wants a complete a new bathroom, you could do the requirements capture at the start and then run the job calling on the services of plumbers, electricians, plasterers, tilers etc. Then be on hand to smooth over all the snagging etc at the end. The trades people may like the idea of being able to get in and do the job without having to worry about making good at the end or even spending too much time working with the customer establishing requirements. Since you are not doing all the work yourself you get a chance to duplicate your time a little since you could probably run more than one job at a time, or run one and carry out smaller handyman ones in parallel.
I guess in reality you would have to analyse your sales records over a period of time to work out where most profit comes from (i.e. repeat business or new prospects), and devote your marketing efforts in an appropriate proportion. It sounds like the sort of area where ones initial assumptions may be way out.