If you ask any AWS geek , what is the biggest change they have noticed after moving On-Prem workloads to Cloud, you will mostly hear typical well known answers "better management" , "Less Operations overhead "...so on ..
One important trait which they aquire but will not acknowledge as they are not aware either is acquiring a "Mulah mindset" . [ for those who are wondering what mulah is, let me make it simple. mulah ~ money"]
Be an Architect , IT manager, Developer one thing you need to be good at when working with AWS is costing. I know its hard , never had to deal with costing before so frequently as old school style only involved painful money discussion during the budget cycle when capital investment needs to be budgeted during initial stages of planning.
Good part is, you don't need to have a Phd to understand costing but do need to spend some effort to get used to calculation. [ Paradigm shift is good thing]
AWS provides some good tools and lots of information to make life easier . Below are some useful links