And be aware, that even if you have the fees for the renewal, they can revoke your certificate at any time and you can no longer resell domains
I've seen quite a few Registrars over the years go down this path and find their ability to register and/or renew domains revoked a year or two later.
Nobody's saying that it can't be done, but likely it's not a path that you want to experiment with. Definitely if you're looking for advise on a forum on how to go about it, you probably don't have the manpower or infrastructure to handle this kind of task. It's nothing against you. The odds are stacked very high against you that's all.