Work smarter not harder you could look at using someone like Maddy cook pricing coach , she will help you charge your worth , this way you will be charging more per service, and eases the work load slightly. Don't fret if you loose a few clients as this opens up space for those who are willing to pay that bit more.
Do you have members of staff? If you want to ease your work load, then you could send a member of your team on a new training course. This will continue to bring revenue into the salon, potentially attract new clientele but means that you're not adding to your work load.
Contact your colour house and see what new courses they have , see what new products they have, and advertise all these exciting things. Your clients love to see stuff like this, it makes them feel like they're money is well invested. Even if these things don't cost you anything, they don't know that.