From what I know of the lore it seems only 2 Human perpetuals exist currently besides maybe Roboute since the Emperor just stopped him from dying 'recently'. They seemed to be pretty numerous before the Horus Heresy among the Emperor's following until many of them decided to bail on him, but for the ones that stuck around (excluding Malcador since he was sacrificed on the throne) what happened? Even the ones that ditched the Emperor, where are they now?

It seems there are no perpetual Humans anymore, maybe i'm just not looking at the right stuff, I know they are rare but beyond the Horus Heresy they seem to have just ceased to be in the narrative.

(sorry for rambling)
TLDR: What are the remaining perpetuals doing now, if anything?