I have this idea in my head for keeping busy when I retire, someone will prolly call BS but i'm throwing it out there:
Volunteer as a light handyman for old folks and shut-ins.
I'd organize a registration through my church or something to get a list of folks who need stuff fixed around the house but cant do it themselves and can't afford to pay a pro.
I'd fix locks, doors, windows, some appliances, not much electrical, etc. Stuff to keep them safe and warm.
Just part time, a few hours a day once or twice a week. Nothing too big or complicated but enough to make a difference and feel good. No yard work or painting tho
That would be more fun than anything else I can think of.
I hope I'm not too jaded to care by then.