All of the things you mention have so much competition, it's not going to be easy to make enough money to quit your job in the short-term (if you want to rely o

All of the things you mention have so much competition, it's not going to be easy to make enough money to quit your job in the short-term (if you want to rely on advertising). Maybe in 5 years if you started now. It's better to come up with a product and then use blogging/podcasting/articles to promote it.