Ask HN: How to answer Enterprise Architecture interview questions?

I have had couple of interviews where i did not succeed for an enterprise architecture role. The questions were very normal and such that one can logically answer.

For example, how would you help a client reduce their cloud computing cost? or

how would you sell AWS/GCP/Azure to a client?

For the first question above, i had given a brief point based answer to begin with then expanded on each point.

Not sure how to crack these? Any ideas would be really helpful.

Thanks!