Can I regain the free tier.

About 4 months ago while learning asp.net I took a look at azure and since being completely new to cloud I clicked unsubscribe and lost my free benefits. Now I realize how stupid that was because I started learning azure and am making a microservices application so now the free credits would be amazing for learning and implimenting service bus in my application and so on. Is there a way to renew the subscription since I only have one bank card that would get accepted at the moment?