Hi writer, welcome aboard.

I used to do more work for individual customers than I do now. Unless you know them irl, internet transactions with customers can be a bit risky.

When I have worked with individuals, I have preferred to take work from individuals that I can meet in person. Consumers who want help improving the quality of their existing manuscripts often require a personal meeting anyway as it protects both parties. That may be a limited option for you depending on where you live but if you live near an urban area, it could provide an additional outlet.

If you live near a school, you can advertise on campus. Before I moved to my current location, I worked in a college writing lab and helped students polish their projects on campus.

Another option is to develop your own website. It's an idea I play with from time to time but I have honestly been so busy that I keep setting it aside.

Freelance writing websites and forums where jobs are posted are another resource. Again, the warning about online work applies.