When crafting recipes for armour and weapons for your archetype, e.g mage, and do 200 kills to unlock your mutation for the build. It would be great to also open a skill tree similar to those from Avowed, however will a lot of progression needed. Either science currency + number of kills e.g. 250, 300, 350, for each skill/perk point. This would add more deeper customisation in your build types whilst hunting down more science points and have another sink to put them in.
I love Avoked and would be great to bring in some perk from that game too to add to the create start of archetypes in Grounded. And when unlocking a skill/perk point, a storyline would update to take to the computer to find out about skill trees.