Unsubscribe to all YT channels at once.

Step 1: Go to this link or paste it in your Browser (Open it in your PC only) 

Step 2: Now Press "F12" or right click anywhere and click on Inspect.

Step 3: In the inspect section on the top bar go to console and paste the following Script.

Step 4: Hit enter

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SCRIPT 

 

var i = 0;

var count = document.querySelectorAll("ytd-channel-renderer:not(.ytd-item-section-renderer)");

myTimer();

function myTimer () {

    if (count == 0) return;

    el = document.querySelector('.ytd-subscribe-button-renderer');

    el.click();

    setTimeout(function () {

        var unSubBtn = document.getElementById("confirm-button").click();

        i++;

        count--;

        console.log(i + " unsubscribed");

        console.log(count + " remaining");

        setTimeout(function () {

            el = document.querySelector("ytd-channel-renderer");

            el.parentNode.removeChild(el);

            myTimer();

        }, 250);

    }, 250);

}