unsub.js

// based on https://www.techjunkie.com/mass-unsubscribe-youtube/
// by YOGIE 
var i = 0;
var count = document.querySelectorAll("ytd-channel-renderer:not(.ytd-item-section-renderer)").length;

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);
}