How to Get Existing Subscribers into a New Flow?

Hi everyone,

I recently started a new flow that's tied to a list that already had subscribers. It seems that only the new subscribers who join the list are going through the flow. I need a way to ensure that all subscribers on the list, including those who were already there, receive these flow emails.

Here's what I've considered so far:

1. Creating a Segment: One possibility is to create a segment of subscribers who were on the list before the flow started. I could then manually send them the same flow of emails via a campaign. However, I'd prefer to keep things automated if at all possible.

2. Reimporting the List: I'm also thinking about exporting the list of people who joined before the flow started and then reimporting them to the list. This might let them go through the flow again, but I'm not even sure if this can be done. I also have concerns that this could interfere with my metrics. Usually, flow emails perform better than campaign emails since they're trigger-based. If the flow statistics include a bunch of subscribers who joined a while ago, the results might resemble those of a campaign instead.

If I want to keep things automated and avoid manually sending out emails, would reimporting the list actually work? Or is there another method to ensure people who joined the list before the flow started receive these emails?

Any ideas or suggestions would be greatly appreciated!

Thanks!