Follow users who have liked an Instagram post

auto_follow.js

(() => {
  let followButtons = [];

  const _getUsers = () =>
    document.querySelector(".sqdOP.yWX7d._8A5w5[type='button']");
  const _getFollowsButtons = () => [
    ...document.querySelectorAll(".sqdOP.L3NKy.y3zKF"),
  ];
  const _getContainer = () =>
    document.querySelector(".Igw0E.IwRSH.eGOV_.vwCYk.i0EQd").children[0];
  const _plusOrMinus = () => (Math.random() < 0.5 ? -1 : 1);
  const _randomTimeout = () =>
    _plusOrMinus() * Math.floor(Math.random() * 500) + 3000;

  const _scrollDown = () =>
    (_getContainer().scrollTop = _getContainer().scrollHeight);

  _getUsers().click();
  setTimeout(() => {
    followButtons = _getFollowsButtons();
    _follow();
  }, _randomTimeout());

  function _follow() {
    try {
      if (followButtons.length === 0) {
        throw new Error("No hay usuarios.");
      }
      current = followButtons.shift();
      current.click();
      const _createTimeOut = () =>
        setTimeout(() => _follow(), _randomTimeout());
      timeOut = _createTimeOut();

      if (followButtons.length === 1) {
        clearTimeout(timeOut);
        _scrollDown();
        setTimeout(() => {
          followButtons = _getFollowsButtons();
          _createTimeOut();
        }, 2000);
      }
    } catch (err) {
      throw new Error("Ha ocurrido un error al dar follow.");
    }
  }
})();

For run this code go to https://www.instagram.com/p/{POST_ID}

Important: This code not working in post of a video