I use tuta mail and tuta calendar for mail and calendar, Vivaldi as browser on laptop, and Firefox on android. Bitwarden as password manager and bitwarden auth as 2fa. Use obsidian for notes and appstore is aurora store and droidify, I use archlinux. And for "cloud" storage, actually a backup I use This USB drive not cloud Buf works for me. Still kinda dependent on proprietary messaging platforms, but I have 1 friend on signal. Also I am trying to replace YouTube with fmhy.net not exactly YouTube alternative, but has so many resources for free to study, educate myself, or just watch something out of amusement.
For me it is also difficult to get rid of Whatsapp because family and work use it. I really like YouTube and am still hoping for the great next YouTube alternative. I use Proton for mail, calendar and online Drive. I use a Chinese mobile with F-droid and Aurora Store. I also have an old Pixel phone with which I'm experimenting with GrapheneOS For my desktop I'm still experimenting with which Linux is the best fit compatibility wise.
I'm currently using Brave as browser but I'm thinking of switching to Waterfox or Vivaldi.
Edit: and my DNS is from a European server.