Why is privacy not more common? Simple: Surveillance capitalism is extremely profitable.
Advertisers today know who you are, where you are, when you are doing everything you do, what you like, who you like, can build social graphs about you, learn your buying preferences, shopping history, know what stage in life you're at, your race, gender, politics, and countless other metrics, all of which fit into predictive models so you buy what they want.
Imagine instead trying to build a business knowing nothing about a person at all, what then do you even sell them?
Privacy can only really become more prevalent if it's profitable.
To make privacy more commonplace, buy from businesses that do not collect so much personal data. Use Monero instead of a credit card, when possible.
It is by being an economic force that privacy gains momentum. This then bleeds into the politics such that laws that do not respect privacy are less likely to get passed.
Making privacy more profitable is not to say it will overtake surveillance capitalism, but that it can become big enough that more people can live completely using privacy tools, technologies and products.