I'd really recommend diving heavily into Zombie. I keep meaning to. Vein feels like the 1st/3rd person version of Zomboid, except that Vein is not nearly so feature-rich (yet).
My ideal would be a game that feels like the exploration and scavenging elements of The Walking Dead. I don't especially need fast crazy zombies, but I do want them blend in with the debris of the world when torpid, furniture like bookshelves knocked over and possibly Zs hiding under there, etc. Can't just walk into a bookstore and have easy sightlines through half the place and spot every foe before having to deal.
While I'm wishing, the group/colony dynamics of State of Decay 2, base building that at least lets me reinforce/fortify stuff and scrabble up some walls...