People often notice that moving to the cloud doesn't reduce your infra headcount and I think that's because after you move to the cloud, you can to take advantage of the tools available at a higher level of abstraction so they can become a high-uptime high-throughput saas essentially. Before you move to the cloud you have a bunch of infra engineers upgrading software and replacing hardware. After you move to the cloud. Well you're often still upgrading software, but you're finally free to do all the things you wish you could have done as an infrastructure engineer.
Test your backups. Improve High availability, tune your load balancer settings. Improve logging and metrics. Chaos engineering.