That is the last thing left for me to do before finally deleting the gmail account.
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Very easy with CardDAV. Sign up for a Nextcloud account, install DavX5 on your phone, and setup CardDAV sync on your PC in Thunderbird/Gnome/etc. You can also use Etesync if you want more security, although it definitely is more challenging to use.
Try etesync and support an open source project