Mostly trade and things to improve sustainability more than “HUNT ERRYDAY”, so farming.
More enemies, and an improved spawning system, one that makes it possible to have an area “safe” for a few days, or up to a week before more zombies pour into it.
Enemies like hivebots, bandits, bionic zombies, mutants that have generated mutations so that one mutant you see might be far weaker than that last one you encountered, or vice versa.
Definitely implementing a way to make bionic CBMs with the electronics and mechanics skill, as I feel the electronics skill is kinda weak and doesn’t offer a great deal.
Should be a way to produce clean water via distillation over time, water purifiers are instant but this one would provide cleaned water from rainfall, maybe a drain along your roof that collects water into a container, you take that container and put it on a still, your water boils if there is a small fire under the still and you leave that there for a few days, one still likely wouldn’t provide all the clean water you need.
EDIT:
While I’m talking about some stills how about booze making alongside farming if it ever gets implemented? Granted you’re never going to be farming the cactus’ required for tequila but it does open the door for a right good bottle of moonshine!