go to your instagram page > open your fallow list with > open inspect > toggle device tollbar > paste this on console > run and see the magic happens

unfollow-instagram.js

// I've got inspired by this code: https://github.com/pbradaric/instagram-unfollow-script

var ufwTotalCounter = 0;
var ufwCounter = 0;
var maxUfwsPerBatch = 13;
var fwButtonSelector = document.getElementsByClassName('_5f5mN')
var length = fwButtonSelector.length - 1 === -1 ? 0 : fwButtonSelector.length - 1
var delayBetweenUfwClicks = 4000;
var delayRandomness = 4000;
var delayBetweenUfwBatches = 600000;
var person = '';

var scrollingElement = (document.scrollingElement || document.body);
console.log(fwButtonSelector[length].textContent === 'Following');
function unfollow() {
    var delay = 5000;
    if (ufwCounter < maxUfwsPerBatch) {
      console.log('UNFOLLOW BUTTON ===> ', fwButtonSelector[length])
      console.log('length ===> ', length)
        if (length) {
          console.log(fwButtonSelector[length].textContent === 'Following');
          if (fwButtonSelector[length].textContent === 'Following') {
            fwButtonSelector[length].click();
            ufwCounter++;
            ufwTotalCounter++;
            length--;
            person = ufwTotalCounter === 1 ? 'person' : 'persons'
            console.log(`Unfollowed ${ufwTotalCounter} ${person}`);
          } else {
            scrollingElement.scrollTop = scrollingElement.scrollHeight;
            fwButtonSelector = document.getElementsByClassName('_5f5mN')
            length = fwButtonSelector.length - 1 === -1 ? 0 : fwButtonSelector.length - 1
            console.log("No more 'Follow' buttons. Scrolling down.");
          }
        } else {
            scrollingElement.scrollTop = scrollingElement.scrollHeight;
            fwButtonSelector = document.getElementsByClassName('_5f5mN')
            length = fwButtonSelector.length - 1 === -1 ? 0 : fwButtonSelector.length - 1
            console.log("No more 'Follow' buttons. Scrolling down.");
        }
        delay = Math.random() * delayRandomness + delayBetweenUfwClicks;
    } else {
        ufwCounter = 0;
        delay = delayBetweenUfwBatches;
        console.log("Pausing with execution for " + delay/1000 + " seconds...");
    }
    setTimeout(function() {
        unfollow();
    }, delay);
}
unfollow()

Thanks man! i change var delayBetweenUfwClicks = 4000; for 60000 and this number "_5f5mN" each has its own in each instagram account, you have to click on inspect the "following" button to see which is your own "_5f5mN"! At the moment yours is the only script in operation! the rest is blocked by using "Script.src"!