I enjoy writing fiction. The likelihood of eventually earning an income from it is pretty slim because traditional publishers are highly risk-averse these days. However, Amazon, Goodreads and others have opened the door to free self-publishing in recent years, so I will tout my wares on there when I'm ready.
At best it will only be a supplemental income. People who have trodden this path before me say that the extracts I've shown them need only minor tinkering. Honestly, even if I never make a penny piece from it, I'm doing something I enjoy. Unlike with window cleaning, I'm learning new things regularly, so it keeps the mind active as I start ageing.