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.