Image Resizing and cache revalidation

Hi there, I have a system setup on AWS using S3 to deliver images via Cloudflare’s Image Resize service. However the AWS data transfer costs and the Cloudflare Image Resizing costs are a lot higher than expected.

These origin images that are used are immutable, so ideally they would never expire in the cache. I have set the cache-control max age to be 1 year which has resulted in the cache’s expired requests have dropped significantly which is good. However there are still a large amount of revalidation requests which I believe count as a resize request in the billing. Is there a way to stop cache entries from going stale/revalidating?

Regards,
Luke