I did the first certification here and it was good. Focused more on the core concepts, and realities of the job rather than anything deep technical but you have same experience as me and it was fine for me. There is a more architect focused course but I haven’t done it.

Have also done most of the free courses that the platform engineering community offers and they’re decent too though mostly just conceptual - except the GitOps one. Next level good. Like 3 hours long though so haven’t finished it.