So Stranded Deep has 5 different skill sets.
To my knowledge games that have skill sets that when a skill gets maxed out you get some kind of bonus.
I’d like to suggest this to happen in SD.
They don’t have to be huge be it would a nice incentive.
-Maxed hunting skill you might get a sharpening stone or a fishing net
-Maxed cooking skill could be a pot or a drying rack for jerky
-Maxed harvesting skill could be a woven basket or a machete
-Maxed physical skill could be diving tanks (using existing air tanks) or flippers
-Maxed crafting skill could be increased durability for tools or be able to craft refine hammer.