Yeah it took a huge amount of effort so far, but I'm about 80% through. It helps that I have been using Linux and Foss in general in work and play (but rarely desktop) since the 90's. I realize I won't get to 100%, for example email is way too much hassle to self host for me personally. Protonmail has been a solid middle ground for me coming from Gmail. Some accounts I simply can't change the email so those are going to stay forwarded for now.

The biggest outlay so far was switching from Evernote to Joplin, as I had over 12 years of history (270 notebooks, 12,000 notes). It took me something like 4 full days of effort but feels glorious now that it's done.