tiktokSort.js

function getNumber(el) {
  const value = el.querySelector('[data-e2e="video-views"]').textContent;

  if (value.endsWith("K")) {
    return parseInt(value.replace("K", "")) * 1_000;
  } else if (value.endsWith("M")) {
    return parseInt(value.replace("M", "")) * 1_000_000;
  }
}

const container = document.querySelector('[data-e2e="user-post-item-list"]');
const children = container.children;
const sortedChildren = Array.from(children).sort(
  (a, b) => getNumber(b) - getNumber(a),
);

container.replaceChildren(...sortedChildren);