the Add Expires Headers are all related to 3rd party requests such as Google Analytics, fonts etc. unfortunately you can’t add Expires Headers to 3rd party requests.
Likewise URL redirects are come from your shortpixel CDN – this shouldn’t be an issue as the shortpixel should offset the redirect time by serving the compressed image. You can test if theres an improvement by removing the shortpixel CDN.
Use a CDN – this is only important if you’re site is going global. If you sign up to a free GT Metrix account you can select a server local to your sites server when testing. Worth running the test more locally.
Make Fewer HTTP requests is the best way to improve perfomance. These requests are JS and Style sheets – the optimization tips we provide here can help with that: