You can start making your own small goals like creating small habitats in the transformer's offices, making a movie theater in the bunker, going hunting for stuff with a metal detector, fishing, etc. But the game definitely needs more mechanics because you'll still find yourself in the position where you've already accomplished everything and don't feel like doing any chores except the mandatory signals.
The good news is that the game's nowhere near the final release, the dev will for sure pack it with content to come. After all, the huge base overhaul pushed the game from the "demo" to the "pre-alpha" stage according to the dev, so he for sure has a lot of stuff planned for the game. If I were to bet I'd say once VotV gets a proper release, the current version of VotV would look to us like early prototype builds look to us today.