What chuck123wapati said.
I retired about 4 years ago. You have to engage your mind, body, and soul. Get a daily devotional book or something and spend time with your Bible. Get some exercise or other physical activity - you don't want to get fat and slovenly, and you'll feel better. Go explore that park or trail you've always been wanting to. Read. Energize your mind. The number of books I've read in the last four years is astounding. Those hobbies you've been wanting to get better at? Now that I have the time, I've been doing more wood work (already had the tools), built a few more radio control airplanes, and started making knives. Then I can make sheaths to go with them. 😁 Everyone needs one more belt or holster. Travel. Have done 2 cruises, and we hook up the RV and make a long road trip at least once a year. Go fishing during the week when everyone else is at work.
I don't know how we had time for jobs . . . .