I've managed to live with #GrapheneOS for a few years now, and the only Google app's I still use are Photos, Gboard and Pixel Camera. Oh, and Google wallet, but not for bank cards because NFC payment functionality is disabled in Graphene, but I need Google wallet if I want to buy tickets to shows that only provide e-tickets.
And I hate the fact that I'm still bound to Google photos. I don't use Gmail anymore, but I still have a Gmail account so that I can store my photos. That's the next thing.