I'm Miles from the Social Care team at Shopify. To change your payout bank account, you will need the details of your old account. I recommend contacting your bank, as they'll be able to provide you with the details of the closed account so you can enter the information. Once you've got the old bank details, you'll be able to follow these steps to update your bank account:
You can also find more information on updating your banking details here: https://bit.ly/3oNOQPy.
If you're not able to obtain the account details from your bank, then our payments team will need to manually remove the details for you. This requires further authentication so can only be done via our live support team here: https://bit.ly/3i52f21. Your Support Advisor will raise a ticket on your behalf and you'll receive an email within 3-5 business days to confirm the bank account has been removed and you can add in your new details.
Now that you have regained access to your account, are you ready to relaunch your website, or will you be making changes? I recommend checking out Shopify Compass. Shopify Compass provides you with webinars and courses on things like store design, marketing and more. It's 100% free for everyone and new content is being added all the time. This program will help you drive more traffic into your store and also convert that traffic into sales. Marketing is super important, and Shopify Compass will help you become a pro.