Why can't I repurchase my Wix premium plan?
If your premium plan was canceled due to payment issues, it will not be possible to repurchase by updating your payment details for that plan. Rather, you will need to upgrade your site again.
To upgrade your site: Sign in to your Wix account > under My Sites, next to the relevant site, click Upgrade.
To unassign a site: From the top menu, hover over Subscriptions > click Premium Plans > under the relevant plan, click Unassign.