async function unsubscribeFromChannel() {
  const likedVideoElements = document.querySelectorAll('ytd-channel-renderer.ytd-expanded-shelf-contents-renderer .yt-spec-button-shape-next__secondary-icon');
  let i = 0;

  const intervalId = setInterval(() => {
    if (i < likedVideoElements.length) {
      likedVideoElements[i].click();

      setTimeout(() => {
        const menuItems = document.querySelectorAll('yt-formatted-string.ytd-menu-service-item-renderer');
        
        if (menuItems.length >= 4) {
          menuItems[3].click();
          document.querySelector('yt-confirm-dialog-renderer.style-scope.ytd-popup-container button[aria-label="구독 취소"]').click();
        }
      }, 200);

      i++;
    } else {
      clearInterval(intervalId); // 모든 작업이 완료되면 interval 정지
    }
  }, 300);
}

unsubscribeFromChannel();

  

복사해서 콘솔창에 붙여넣으면 된다.

만약 안된다면 allow paste나 allow pasting을 친다음에 붙여넣자