I recently tried to clean up my digital life. I switched to Linux and switched to GrapheneOS and made more use of my proton subscription to replace google.
But I have a few questions :

I tried coveryourtracks.eff.org/ on Librewolf on my PC and Vanadium on my phone and it say I have a nearly unique fingerprint.
Is the benefit of using a privacy focused browser neglected by the low userbase and unique fingerprint ?

I did not have a great digital hygiene before so I have a google account, meta...
How do I clean this up ? Are services like Incogni any good or is it just marketing ?

Finally I wanted to use tails with persistent storage to use as a live system if I ever need to use a PC that is not my own to connect to my accounts. However, I don't want the ISP to know I use Tor. I see it as a big "I have something to hide" flag for the ISP.
But my understanding is if I install a VPN on tails it will be Tor over VPN (bad if I understand correctly) instead of VPN over Tor. Should I use something else than tails since I only want/need always on VPN with kill switch.

Thanks a lot for your help. I want to say the journey is much easier than what I anticipated. The hardest part is making people switch around me. The lobbying has started.