Plain old Indeed job postings and looking at their resumes, speaking to them and seeing what motivates them. It was pretty easy to hire in Chicago due to plenty of candidates for the copywriting roles. We got lucky in finding a few people who didn't fit the traditional molds but were eager to learn.

We also kept an SEO analyst type role posted for over a year (salary was posted at 65-75k in far suburb, 2015 vintage, so fairly competitive at that time) to see who would apply, and out of 100+ applications we only hired one person (the company I was at would hire qualified people to grow headcount-- I'm ignoring that dysfunction here). Most of the applicants with claims of "5+ years experience" couldn't describe concepts like nofollow, anchor text importance or the difference between robots.txt and meta tags. I've also hired in 2mm population midwestern metros and it gets a lot harder. In less populated areas, remote will probably help quite a bit.