I did not receive a payout to my PayPal account because at that time my account was restricted due to the need to verify my identity. Paypal support told me that therefore the funds were returned to the sender (itch.io). Now that my PayPal account is verified, how can I re-initiate a payout to finally receive it? Thank you

The same way you did the first time. If that doesn't work, please contact support, they handle payments.