Does my plan renew automatically?

No. An Atli plan is a one-time purchase. There is no subscription, nothing renews by itself, and you are never charged again unless you choose to buy.

• You pay once, in the chat, and that is the whole price
• When the data or the days run out, the plan ends. No surprise bill, ever
• You buy again only when you choose to

One thing can look like renewal: with more than one plan on your eSIM, your phone moves to the next one when the current one is used up. That plan was already paid for. That is a queue moving along, and nothing is charged for it. More in When your data runs out.

Never want to think about running out? Pick an unlimited plan where your destination offers one, or add another plan any time and it lands on the same eSIM. How much data do I need? shows the sizes.