I use to care about privacy a long time ago. I would use add-on like better privacy which would delete all cookies after closing firefox and ghostery to block trackers as well as never remembering history. Didn't do much as there was much more I could have done as mentioned in your post.
I stopped doing it because it's such a hassle to remember and retype emails and user names every time I open my browser! Even when I missed the password. I also don't care if they know I like to watch lesbian cat porn. I'm not an interesting person.
Please know this though, if you ever find yourself some how an enemy of the U.S. they will look into all your data. All of it. And run smear campaigns against you.
I also remember when google+ was a thing and I was active on it I posted a comment on some post basically quoting julian assange that "the government and Google work hand in hand to spy on you" I'm not sure if that's the exact quote, however some guy thought I was conspiracy nut. XD then like a year later edward snowden leaked the prism program. Guys, when that shit was big news, a lot of people didn't even care and we're oblivious to what NSA gathers. Complete computer illiterates.