I have been freelancing for three years and my income has barely moved. I keep hearing raise your rates but I am already at the top of what my market seems to pay. Are there other ways to grow revenue without just charging more per hour?

You are not at the top of the market. You are at the top of the market you can see. Most freelancers price based on what competitors charge, not what clients value. Find a client who loses money without you and your ceiling disappears.

I added productized services. Same skills, packaged differently. A one-hour consultation became a strategy audit with a deliverable. The work was identical. The perceived value doubled. Packaging beats pricing.

It depends on what niche you are in.

You can branch out a bit more. Maybe compile a new client base on your own. Find people, businesses, or websites that you feel could use your freelance skills. I have heard of some people landing good pay via news sites where you just cover local or national news. The reporter gets the details and you just write the article.