Ugh, what a chore. What a distraction from what you are actually trying to accomplish. At least without the right tools anyway.
Even 90% strips a lot of size away
Can’t we just crop and optimize in WP media library on upload without paying for a plugin?
Figma plugins, tinyimage gives 15 free uses.
WPSmush WP plugin, smushed all except fullsize image?
Jpeg-optimizer.net, one at a time, no crop very manual process but free and works.