At this level, you are competing with advertising agencies and marketing firms. Or you can turn those ad agencies into your clients - many don’t do the kinds of volume to support an in-house team.
I did well over 200k last year building, fixing and maintaining WordPress websites, working from home in a region with a relatively low cost of living. I expect to do even better this year, though I have resisted the urge to grow via hiring - I prefer to pick and choose my projects and be exclusive. My clients are a mix of agencies and “mid-size businesses”. I turned away another 50k of opportunities that didn’t feel like a good fit.
Beware though: success depends on more than just being able to build nice websites. You have to know how to sell yourself, manage customer expectations and a whole slew of soft skills to position yourself as a trusted advisor and expert. You need to understand your customers business, their challenges and pain points, how their customers think and behave, etc. Etc.