Head over to Steam, or wherever you get your pc games from, and buy a copy of Dysmantle. It’s a Strategy/Open World/Crafting thing.
You leave your underground shelter and find the Island, belonging to some fictional nation, swarming with various types of undead. What follows is you trying to figure out what went wrong.
The big mechanic of the game is that, with the right weapon, you can break down nearly everything you find. Road signs, fire hydrants, bins, the contents of houses, houses, fences, trees, rocks, and anything else you find. All depends on the strength of the weapon you use, and you discover and can upgrade these as you go.
I’ve had it for less than a week and, to be honest, it appeals to the obsessive-compulsive part of my personality. And it’s not TOO difficult, which for this ageing gamer is a benefit.