i'm a 57 y.o. grapic designer-illustrator, in need of a change, recently laid off. i just finished the AWS concepts course, using the free membership. i need to see if this path is remotly doable for me, like do i have the brain-power and interest, before i pay for membership. questions: 1. i've finished it & passed the test, but it says 91% complete, why? do i need to get the full membership to schedule study time (that's the block locked out). 2. in order to get the cert for this, i need paid a member? 3. AWS Essentials should be next, yes/no?4. then Cloud Essentials, then Linux Essentials?