There are local Wordpress meetup groups all over the country. Visit one. The "regulars" usually know who's got the skills for a particular project.
WordCamp conference organizers can be another good resource. (At a recent WordCamp conference, speaker Cody from modeeffect.com seemed especially knowledgeable and experienced.)
If you're new to WordPress, you should keep in mind that WordPress sites require constant maintenance updates/testing to remain secure, in addition to any content mods you may want to make. You'll want to find someone who can be a good ongoing partner, not a "done and gone" UpWork coder.