Father in law was a real estate agent from the 80s until maybe 5 years ago.
The day he retired was the day he absolutely positively suddenly wanted nothing to do with real estate anymore. He loved the career but it was interesting watching him just suddenly be done with it.
He found other hobbies and interests pretty quickly once he took an inventory of how he wanted to spend his time.
Suddenly then all at once has been a common pattern for me too.
Its liberating to have the experience to know that once you're done with something you won't miss it's absence.