How to increase page load speed?

[beefolks1]

I checked the page speed of my website (through services like LightHouse, PageSpeed, etc), and it royally sucks, sitting right around a 9-12.  I've tried compressing graphic files and making certain they fall within the size recommended by Square, with no luck.  What else can I try?  

[maxpete]

Tagging @uniwebdigital, @Donnie-M, and @ryanwanner for potential ideas!