My iPhone 4 randomly shut off and wouldn't turn on. I restored to a backup that was jailbroke. Can I re-JB?

I was on 4.0.1. It is very outdated but I don't mind staying on 4.0.1 but can't figure out how to jailbreak again. Limerain didn't work. How can I rejailbreak? Previously jailbreakme.com was so easy, but now it's down. Any ideas?