2 things: Find a scalable solution to offer and hire a team member.
You may hire someone to be your VA so they can help you with marketing while you focus on sales. Someone with marketing experience with social media, marketing automation, and such should be good.
Find one facet of your services that you can likely offer in a subscription model and start selling it. You won't be able to scale doing 100% custom work so you have to find something that can provide you recurring revenue.
I literally just went through this in 2018 and further expanding in 2019 so I can provide more information on it if needed.