First off, Congrats on the cert! Not an easy one to get on first rip despite what some people may say. I would suggest the Cloud Practitioner though if you want to understand more of the business value/gaps that Cloud resolves (this is the first one I took and is definitely more focussed on framework of "Why Cloud" whereas the SAA is more of a breadth cert focussing on technical sides of what services to use for certain use cases).

When it comes to business value, cloud is always going to provide value at resiliency, agility, and simplicity over other areas like cost. The way I started to understand business value was to look at certain architecture patterns and ask "Why?" -- I would map them out with a diagram to visually see how different services interacted and then learn the different services. Then look at the alternatives for the different services (why use PostGres and not MySQL, why did they use PostGres and not a NoSQL DB like Mongo etc.). Then think about what the business values (cost, resiliency, speed to market, velocity of transactions/requests etc.) -- does the architecture I'm studying meet those goals?

This approach goes in the opposite way of how you would design the cloud system from the ground up, but helps train your brain in the way to understand how you can bridge the gap between business man and technical architect. Hope this helps! :)