Customer success interviews ask whether you can tell the truth about an account. A healthy story names the outcome the customer wanted, the people who were engaged, the risk you saw early, and the ask you made internally. A tour of check-in meetings is not that story.
Keep one account you grew, one you saved or lost, and one where you pushed the product team because the same pain kept returning. If you have only been in support, you can still use a customer you stayed with across several problems, as long as you do not pretend you owned a renewal you never touched.
Practice the difficult update. The sentence where you tell a customer you cannot do the thing they want, and the sentence where you tell your own team a renewal is in trouble, are both part of the job.