Generally, engage with one of the partners, a lot of them do demos of software.
You'll probably want to tell them more than "show me Jira" if you want to get much out of a demo though, as there's a LOT of material to work through on Atlassian's site as well as non-Atlassian places like youtube etc. Any search for "jira demo" will net you huge numbers of resources.
But if you want a partner demo, start at https://partnerdirectory.atlassian.com
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