The gap between “I know AWS” and “I can explain what I built”

Lately I’ve realized the hardest part of learning cloud stuff is explaining how they fit together. When someone or interviewer asks “how would you automate this?” my answer always "hmm..." To fix that, I’ve been running small mock interviews using questions from IQB interview question bank and sometimes the Beyz coding assistant. It’s like stress-testing how well I can narrate my reasoning while coding. And I still use GPT and Claude for scaffolding, but now I try to write the “why” comments before touching code. How do you get better at talking through AWS logic?