Things I do what give me a percieved sense of privacy/ security:
use Firefox with Add-ons (Ublock origin, Idontcareaboutcookies, Istilldontcareaobutcookies, Consent Blocker)
browser set up to block third party cookies and to delete any cookies after closing
not allowing to store any credentials in the browser
using different passwords for different services (not one password for all)
using Two-Factor-Authentification on services which are connected with banking account
not using freemail providers for email
using a temporary email where possible if registration is required
encrypted hard drive and encrypted backups
do not use cloud storage (I rely on old school portable hard drives and thumb drives)
using an additional firewall to stop certain not-quite-legally-obtained programs from phoning home (these programs can’t be replaced through FOSS at the moment, or are too ridiculously overpriced to buy them right now)
restrict/ forbid operating system to collect anonymous data and to phone home (as if that helps…)
don’t do online banking with an android 8 device
The password storage thing sometimes seems to be a hassle. I have stored my passwords in a physical moleskin, written with a pen, like an old person would do. When I have that book not availiable (when travellling), I have to guess my credentials.
At work I have the browser stored all the credentials. It’s so much faster and easier. But since it’s at my job I don’t have to worry about my own private stuff.