Evergreen, I read your older post and this latest one. Congratulations. I imagine most of work done below the senior leadership level of organizations is just as awful on both sides of the pond. I suspect the main reason for worker disengagement everywhere is that working environments have changed, and not at all for the better.
I FIRE in 13 weeks 5 days 12 hours 26 minutes 23 seconds and counting (but I'm not really keeping track ) and am not at all embarrassed to be finished with what passes for work these days. In fact, I tell everyone I meet!
What's great about this new adventure you've entered into is that you can make it any way you want. I can't imagine anything better. Have you thought about doing some reading regarding life after retirement? You could start by searching threads here.
Good luck with your FIRE, I won't be too far behind you!