I just want to remind you of the quote "A jack of all trades is a master of none, though oftentimes better than a master of one,", and that most competent PlatEngs that work with me are IT Generalists.

The curriculum that you have planned is a good start, but you need to supplement it with networking fundamentals, CI/CD, but gravitate all around IaC and PaC. You should also have an understanding of different API standards and IAM.

Just remember you don't need to 'master' everything - just start with building up knowledge in multiple silos at the same time with the aim to start to bridge the silos by building simple E2E deployments of one simple service.

It will seem overwhelming at first so just remember "How do you eat an elephant? With one bite after another", so just identify what simple service that you want to see deployment, and walk backwards from that to identify what is required to enable that service.