This is an accepted solution.
This is Finley from the Social Care team at Shopify.
Thanks for reaching out! Normally, to transfer a domain you purchased from Shopify you could follow the steps in this guide if the store were still active.
However, because you no longer have access to your account we'll need to take a closer look at what options are available to transfer your domain. While we’re not able to provide account-specific support via the Shopify Community at this time, we’d be happy to continue assisting you through live chat, email, or callback. Please visit https://bit.ly/3cJkx8V and log in to your account to create a support request.
Since this is the next step I've marked this reply as the solution for the benefit of others who may discover this topic. Thanks!