If you are a writer, have you considered signing up to MEDIUM and writing for them?
It isn't easy to make a good income but if your writing is great and you write consistently on a daily basis, you could realistically make £300-£1000 a month from people reading your articles.
Alternatively, have you considered writing on your own blog about a subject and then adding affiliate/referral links to them so that you let your writing do the work and the money comes from people enjoying it and signing up for whatever you write about?
I can give you one example, the company I work for offer dating sites. We have a female blogger that writes about adult toys, relationships advice, self-pleasure, etc and receives about 200,000 visitors a month.
She found that while a lot of the traffic was female, there were a lot of males looking for something naughty or to hook up. What she did was approach us with her problem and we arranged for her to have a fully hosted, fully operated dating site that she could write about and add a link/banner to on her blog, and every time a male joined the site looking for "fun" she would direct them to her dating site (we provided) as a place to find casual fun like they were looking for.
What she found was that while her blog was generating her about £4,000 a month revenue, plus another £500 a month from affiliate sales for toys, etc... it was actually the dating site and the male traffic that was bringing in the most. First month was about £600 a month, by the 6th month it was up to £4,000 and by the end of the first full year she was generating £11,000 a month from the dating site.
Because of that, she decided to introduce an entire blog category about girls looking for casual fun and linked their profile from her blog article about them. This caused her traffic to surge as men were keen to meet these girls and talk to them, which in turn led to more people joining her dating site and generating revenue.
Now, she makes about £25,000 a month (in total, including e-sales, advertising, sponsors as well as her dating site) and she works full time as a writer on her blog and also employs two part time writers to help her create more content.
Simply writing is not usually enough to make a full time living if you want to work from home as a self-employed person. You have to turn it into a proper business with multiple revenue streams and use your writing as a marketing tool that entertains your traffic but also converts them into paying customers. The company I work for is one such revenue stream that works if you write about anything adult-related or romance related.