I skimmed a book that argued octopuses may be as, or nearly, or differently but equally intelligent as humans.
https://www.amazon.co.uk/Other-Minds-Octopus-Evolution-Intelligent/dp/0008226296/
I thought the Philosophy Now article on panpsychism was pretty good. If it doesn't convince you fair enough.
What I meant to say is that the idea that consciousness arises from unconscious matter is just as unprovable as panpsychism. This may be difficult to grasp because reductive materialism is pretty much taken for granted in our culture. But just because it's taken for granted doesn't mean it's true, or that it should be let off the hook in terms of requiring evidence.
Some of the resistance to panpsychism may be a suspicion that it aims to create a space for God or the supernatural. But there is no reason panpsychism should necessitate belief in God. In fact, in some sense materialism's "hard problem" of consciousness is one of the best arguments for God, and panpsychism tends to defuse that problem. So it's not entirely clear what the implications of panpsychism are for God or the supernatural.
All I know is that reality appears increasingly mysterious to me. And as Krauthammer once quipped, atheism appears to be the most unlikely of the theologies on offer. There is a deep mystery at the heart of existence. Why is there something rather than nothing? Why are we uniquely equipped to perceive the world as it really is? Reductive materialism offers no answer to these questions. In fact it doesn't make much sense as a view of reality when all its perameters, including the mystery of existence and consciousness, are taken into account.