Most of the adults on the island have been captured by the Collector. Resulting in the children barely having a stable society.
Lilith had stopped dyeing her hair; its reverted to her natural orange.
Belos continues to degrade in body and mind; beginning to hallucinate his dead brother glaring at him, while barely surviving.
The Collector isn't malicious. He just wants friends and doesn't undertake mortals.
If Belos hadn't found that spare Grimwalker corpse to absorb and stabilize himself, he very well would have died.