The correct thing to do in FIRE is to focus on the financially independent part: the freedom you gain from having financial security. If you no longer needed to work for money, what would you do with your one and precious life? Would you travel the world full time? Write that book you've been thinking about for decades? Start a business or non profit?
I feel some shame for not having great answers to many of those questions. Or, maybe I should say that the things I'd choose to do are not all that different from what I'd already been doing while working: playing board games, writing and reading, hanging out with my friends, watching the kids, cooking, tending to the house and the cars, taking some tasty naps. But these are mundane and totally ordinary pleasures. None of them require retirement. The only somewhat impressive thing we'd like to do once financially independent is travel more abroad, and we were kind of doing that already.