Check your segment and time frame. Toggle to a time frame that includes the dates that your Guide was or is live.
If you previously saw metrics but no longer see them, check that the Guide is still published – someone might've changed the status to Draft, or the Guide might have an expiration date applied.
If the Guide is published and there is still a lack of metrics, it could be because the Guide is contextual (targeting an element in the UI). If the Guide is associated with a particular element, ensure that the element still exists. A drastic loss in views might mean that the Guide is broken and is no longer activating because the element it was positioned to no longer exists.
If the Guide delivered through a Badge, a lack of new views might also indicate that the Guide has served its purpose for the existing users and they no longer need it for help. As you add new users to the environment, you might see more new use of the Guide.