I earned a little north of this in my previous career: copywriting for advertising and marketing agencies.
It was a good shout for me because I'm good with words, creative and can absorb information quickly. I also liked agency environments. They can be laid-back, fun and carry a sense of team spirit (caveat: not all of them).
Getting into it is competitive. I had a good degree in English from a decent university, and I had to demonstrate keenness and creativity. It wasn't unusual to be up against 70 or 80 people for a job, although I discovered later that 80% of these tended to be chancers. (A lot of people think they can write copy. A lot of people are wrong.)
Sometimes I'd work a 30-hour week (there was flexibility around coming and going; as long as the work got done no one really cared) and sometimes it'd be 50-odd, which still wasn't bad compared to other sectors. When agencies pitched for business we'd do the occasional small-hours finish or even an all-nighter, but that was rare.
Agency copywriting jobs tend to be concentrated in larger cities. In the UK, most of the industry is in London, Manchester, Edinburgh, Leeds and Newcastle, although there are smaller agencies all over the place. There are opportunities worldwide, of course. Especially in Europe, the US (New York and Chicago particularly), Singapore, Dubai, Sydney and Melbourne, and Hong Kong.
I've moved out of that career now, mainly because I'd reached the level I wanted to get to and had become bored. I didn't want to get into the management level. I retrained in something more outdoorsy and physical. Now I mainly do that, with a bit of freelance copywriting on the side. These days I earn a little less than 50k, but I am more fulfilled (not to mention physically fitter).
The people I know who are most fulfilled by their work are the ones who have some agency over their work lives. Some of them earn less than 20k a year, but because they are respected at work and have a way of making their voice heard, the job carries a sense of fulfilment.
Businesses that treat their people like batteries to be drained or used up, at any salary level, are the ones to avoid. It's a lack of control and/or respect that crushes people, not (necessarily) a low salary.