You're confusing expertise with success. Deliberate practice will make you a better writer. But you can be an expert writer without having success at making money or getting attention for it.
If there are more writers than there are slots for successful writing careers in the world, things like connections and luck are the type of thing that put you ahead in the competition for those careers. The best writers don't automatically get those careers.
If there are more writers than there are slots for successful writing careers in the world, things like connections and luck are the type of thing that put you ahead in the competition for those careers. The best writers don't automatically get those careers.