Is there a way to reset analytics tracking?

No, analytics tracking cannot be reset.
You can, however, focus on a specific time period by adjusting the metrics settings to view only the data you’re interested in.

If you’re looking for a fresh start with no analytics history, consider cloning your board. When you create a clone, you can copy all active (non-archived) tasks, but task history—including comments, assignments, and analytics—won’t carry over. This gives you a clean slate while keeping your current tasks intact.