This is a free and open-source app on Mac, https://imageoptim.com/mac. Drag and drop your file, it optimizes images and give you smaller output.
This is even better, squoosh is a nodejs app (written by Google Chrome team), and run on browser. The hosted version is here https://squoosh.app/
And this has highest optimized size for your images https://tinyjpg.com/ . It also supports drag and drop multiple images and download at once.
