Every area should get tons of collectables for you to find.

Imagine them hidden behind enemies and DoL points.
These would go into a treasure log with every area having a set number of slots for you to complete.

The treasure could be hidden in any way possible. Just in a hard to find location, as a FATE reward, guven from a quest, as a fishable item, in shards as mob drops... The sky is the limit. This would make every nook snd cranny a potential place for treasure in the world.