In the present condition, unless we can get people to write for us, there is a good chance that our blog might go unnoticed. A lot of people do write personal life, but almost no one has any interest in it.
Then we can write about things that we are good at. For eg, women can write about Food recipes ( only an example ) and they can be very successful it they choose to give a lot of options.
But in the end, if there is at least 2-3 good blog posts per day, the blog can be a very successful one. Otherwise, it is a lot of hard work and maybe little we get back from it.