Install imagemagick. then run this script to find jpg files recursively and compress them. of course you can adjust convert quality or etc.

compress_image_recursive.sh

#!/bin/bash

# You need to install `imagemagick`
# sudo apt install imagemagick

function compress_image {
    cd "$1"
    HAS_IMAGE=$(ls | grep ".jpg" | wc -l)
    if [ "$HAS_IMAGE" -gt 0 ]; then
        mkdir -p compress
        for i in *.jpg; do
            convert -sampling-factor 4:2:0 -strip -quality 60 -interlace JPEG -colorspace sRGB "$i" "${i%.*}-compress.jpg"
            mv "${i%.*}-compress.jpg" compress/
        done
    fi
}

function traverse_dir {
    find "$1" -not -path "./compress/*" -type d -exec ls -d {} \; | while read x; do
        compress_image "$x"
        echo "Compressing Images ---->  $x"
    done
}

function main() {
    traverse_dir "$1"
}

main $(realpath $1)

# sudo chmox +x ./compress_image_recursive.sh
# ./compress_image_recursive.sh ./images

Iterate Directory recursively and compress jpg images by ImageMagick.
create compress folder inside of each and put an optimized version in there