- Use Linux
- Encrypt files
- Use signals
- Use Android without a google account or a play store
- Use google products as little as possible
- No whatsapp, no Insta, no FB
- Use pcloud encrypted solution for online storage
But even with all that, I'm pretty sure the impact is limited, real privacy would require a lot more. Not to mention banking, power companies and so on are going to sell your data no matter what.
Besides, most people would not even do 10% of this. Not even switch to FF.
And if they are transparent and knows you, they give a lot of data on you anyway.
It's a battle we are loosing.