You question requires some clarification, as it unclear if you're trying to reach a target audience of a specific type of freelancer or you're a freelancer desiring to reach a target audience of potential clients.

I'm guessing your a Freelancer looking for clients, by the 2nd line of your question...

This is super easy.

Give talks at https://Meetup.com events, conferences, anywhere people in your niche meet.

You can also contribute to places like Experts Exchange.

Tip: If you can say something like I'm in the top 100 EE posters, this sets you apart into a different class of human.

Speaking at WordCamp events is great also. You just somehow associate your expertise with WordPress + you have a built in speaking circuit.

Tip: If you can reach the right people who... require your expertise + are dripping in free cash, you too will be a 6-7 Figure Freelancer.

The trick is finding the right people.

Speaking from stage to small or large groups is hands down the best way to attract high dollar clients.