Hope you got payment upfront. Alwys get payment upfront with clients. I hope you didnt get scammed.
Thought also sometimes clients just take soooo long to respond. Though I would assume the worst here. Basically just keep messaging him untill he responds. If he gave you his socials you can reach him there. Right now youre goal isnt to get him to pay you, its to get him to respond. Once he does, then you can move onto payment.
But if youre already paid, than youre chilling