I believe it's not possible but you can always convert your account/instance to a free license
To successfully change to the Free plan for a Jira Cloud product, you need to have 10 users or fewer (Jira Software or Core) or 3 agents or fewer (Jira Service Desk). If you're over that limit when you try to change your plan, the change will fail and you'll remain on your current plan.
Make sure to make a backup of your instance, just in case. All you need to do is deactivate all users, except your user so the instance is only accessible to you. With only your users being active, you would have less than 10 users and that would convert you to a free license, if not, you may want to reach out to Atlassian Support.
When you are ready to start again, you can reactivate back the users!
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