Updating offers for returning subscribers should not be too far apart. If the same offer shows up every time, some people may lose interest. A good idea is to refresh the offers every one or two weeks. This keeps things interesting and gives people a reason to keep coming back. Also, try to make the new offers match the kind of things they clicked on or bought before. If someone likes fitness products, they might be more open to seeing new health-related deals rather than something completely different. It's also useful to mix in seasonal offers or limited-time deals when they make sense. This can create a little urgency. But don't overdo it or send too many changes too fast. People may get tired and unsubscribe. What approach do you think works best when deciding how often to switch up offers?