Unused access findings tell you what AWS did not record activity for, which is not the same as what your workload does not need. Here are the four blind spots in the underlying data, and a deny-before-delete procedure that lets you trim IAM permissions with a one-call rollback.
Moving one WordPress site is easy. Moving twenty in a weekend is a pipeline, and the failures that cost you are the quiet ones: writes landing on the old server, cron firing on two boxes, certificates blocked by ACME rate limits. Here is the fleet migration process I use, from manifest to per-site rollback.
Migrations rarely fail loudly. The site stays up while mail, cron, certificate renewal and the write path break silently behind it. A post-migration checklist for the first 48 hours, ordered by how long each failure can hide rather than by subsystem.