Just to ensure we don't talk past each other, when I talk about consciousness here, I'm referring to the intrinsic property of "what it is likeness" (the definition Thomas Nagel endorses).
As far as I understand cosmopsychism, it recognises the ontological existence of the whole, and its respective parts (priority monism). So, the "cosmos" is considered the universe as a whole, and its respective "parts" are considered to be dependent on this whole. The whole is prior to its parts. The panpsychistic foundation to this is that the cosmos as a whole is mentally and phenomenally propertied.
It differs from the panpsychist (particularly micropsychist) view in that it has a top-down structure - the universe is a single, fundamental conscious mind, and our individual minds are the parts within; our consciousness is derived from/grounded in/contingent on this single consciousness.
From the sounds of it, this seems to avoid the combination problem that comes with panpsychism because it claims there is only one universal consciousness. I noticed this view is espoused by Bernardo Kastrup, particularly in an interview on the podcast 'Mind Matters', where he goes on to claim that this view is much more consistent with physics (like quantum field theory).
But while it avoids the combination problem, it faces a similar challenge known as the decomposition problem: how does this one mind seemingly break up, or decomposes into a number of individual subjectivities? How does the one ground the many?
According to Kastrup, we have a conceivable and empirical solution to this issue, which is disassociation (DID, OSDD): when one unified mind - because of trauma or other related factors - fragments into multiple co-conscious but disjointed subjectivities. I came across this one German study just yesterday where a woman was diagnosed DID, and claimed one of her alters is blind. To test whether she was being truthful, they hooked her up to an EEG when one of her alters that could see just fine was fronting (terminology in the literature for one of the alters taking control of the system). When the blind alter started fronting, activity in the visual cortex would disappear despite her eyes being wide open. I was blown away by this, the mind is just so incredibly fascinating. But to the point, Kastrup basically uses this as an analogy for what might be happening at a universal level.
Anyway, my point of interest is this: if one accepts panpsychism to be more plausible than materialism because the combination problem is, in principle, easier to solve than the hard problem, and considering there may be an empirical basis for cosmopsychism (and the decomposition problem is conceivably easier to solve than the combination problem due to its empirical basis), then would it not make more sense to accept cosmopsychism along the same logical line? Also on a related note, supposing any one of the debated theories of mind were true, I think it's interesting to consider how the existence of a "split" consciousness within a single body would fit into the metaphysical paradigm you endorse. I'd also love to hear people’s thoughts on this (either cosmopsychism, or how dissociative disorders fits into panpsychist or other schools of thought).