As @gcusello said - the only way for the free license to reset itself is to wait for 30 consecutive days without exceeding quota. Of course you can just back up your config, scrap your environment, reinstall it and start a fresh one if your already ingested data is not that important that you couldn't live without. But if I remember correctly if you exceed your license and your search gets blocked, you still can search from _internal which means you should be able to report from the metrics data contained there - license usage, per-source thruput and so on.
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