I tried to migrate a Customer to Seller via this link: my-account/account-migration/seller/
While in the middle of filling out the information requested, my browser crashed. So, I tried coming back to it but this page my-account/account-migration/seller/ doesn't show anything and I can't figure out how to get to that page or how to become a Seller now.
I think it would be a good usability option if we could display that button, or show a link Become a Seller constantly in the header area just as long as user has not completed and submitted the required form.
This way a user will have that option available to him/her at will, even if they don't get to complete the form.