Based on what I've seen, your survey was constructed just the way it needed to be. Since the survey is landing page style, there's no way to track who's started the survey. If you included it in an email you can check the email's reporting to see who's clicked the link so far. Ultimately, if you need to remind contacts you've sent your survey link to, you'd simply want to copy the email you already used and update the wording to reflect that it's a reminder.
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