The incorrect assumption is that I don't think you'll necessarily make more money by being a data science consultant rather than a django/flask developer.
I don't know where you live but where I live you can make 60-70 USD/hr with the skills you already have. Like, make json API server for a mobile app with Flask, that pays anywhere from $50-150/hr in my experience. As someone else mentioned, what you get paid has more to do with where you live and who you work for.