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CSS/JS Failure after using W3 total Cache

i was working on a wordpress website, then i was trying to make it more fast, as per as youtube videos, they download the W3 total cache plugin and start adding the slow css files extention from google speed test to the website to be in manual minify, i did the same and then suddenly the website lost every css/JS i made and i don’t have backup.

i tried to restore the action but i couldn’t any advice ?