Make planters placeable on foundations.
Make a large water still with barrels, tarp, lashings, and sticks.
Make crafting stations placeable on foundations.
Craftable bed.
Large rain catcher on elevated platform using barrels and tarps that auto-waters farm plots.
Large auto-feed bin that can be filled with palm fronds to keep producing water in water still or the aforementioned improved catchers. Use sea water in water stills to obtain salt
Use salt to preserve meat
Scrapping station for unused parts or obsolete items, turns loot into basic materials
I have many more suggestions but they start heading into the realm of multiplayer and building civilization…and that’s not really this game.