Atlassian don't delete the data at the end of the trial, it persists for a while (several months I think). Get a new licence and you'll get access to your data (Even if it's a new trial, rather than a purchase)
I'd try nipping into your account and seeing if you have the option to extend the trial - that will get you immediate access. Then you can go through the paperwork for purchase, and when you've paid that, it'll be the full system.
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