The only way for process server clients to find you online is when your website shows up on their online search results.
People will search for a local process server in the area they need to serve.
Example: I have to serve a restraining order in Citrus Heights California. I will search the following keywords into Google: Citrus Heights Process Server.
The image below is the results of this Google search.
My process server business listing is listed twice on this image. Process server clients contact me via these listings.