Write a Re-Engagement Email for Inactive Users

Write a re-engagement email for users of [PRODUCT NAME] who have not logged in or engaged for [TIME PERIOD, e.g. 30 / 60 / 90 days]. The email should: have a subject line that sparks curiosity or addresses their potential objection (provide 3 options), acknowledge their absence without guilt-tripping, remind them of the core value they signed up for, highlight 1-2 new features or improvements made since they last visited, include a single clear CTA to come back, and offer an optional "opt out" so they feel in control.

Keep it under 200 words. Tone: friendly, not desperate.