alot of this is interconnected, so apologies for repeating myself; they do help build a few themes that stand out.
bad news: somethings are really holding you back.
good news: most, including biggest, can be fixed with one or a few short steps.
good bad news: it all depends.
google's mobile-friendly test returns page partially loaded results
this is the most pressing item i see: googlebot smartphone being blocked by cloudfront's robots.txt.
this affects a few things, most importantly search. its not getting any of your image assets on your index. and i'm assuming from any/all documents that you house there as well.
its also throwing redirection errors on two images, one is ga. the analytics image error could possibly be affecting mobile search/