As already said, pick a niche, and make sure you're known for it. Generate content in that area, you're a game designer, so blog about the issues you've faced, how you've overcome hurdles. If blogging isn't for you, create a podcast, just create content in whatever medium you're most passionate about and do something that makes you a thought leader in that space.

When someone is searching for a solution to an existing problem they face and you can demonstrate how you've solved it, and many more in that domain you're immediately valuable.