This script unfollow your followings except your followers for Twitter.

twitter_unfollower

users = document.querySelectorAll("div[data-testid$=-unfollow]");
user_idx = 0;

function callReload()
{
    users = document.querySelectorAll("div[data-testid$=-unfollow]");
    user_idx = 0;
    callClick();
}

function callClick()
{
    if (user_idx < users.length)
    {
        user = users[user_idx++];
        if (user.parentElement.parentElement.querySelectorAll("div > div > div > a > div > div:nth-child(2) > div").length == 1)
        {
            user.click();
            setTimeout(callUnfollow, 100);
        }
        else
        {
            callClick();
        }
    }
    else
    {
        window.scrollTo(0,document.querySelector("body").scrollHeight);
        setTimeout(callReload, 250);
    }
}

function callUnfollow()
{
    if (document.querySelector("div[data-testid=confirmationSheetConfirm]") != null)
    {
        
        document.querySelector("div[data-testid=confirmationSheetConfirm]").click();
        setTimeout(callClick, 100);
    }
    else
    {
        setTimeout(callClick, 100);
        console.log('I can\'t found unfollow button');
    }
}

callClick();