linkedin-unfollow-everyone.js

(() => {
  let count = 0;

  function getAllButtons() {
    return document.querySelectorAll('button.is-following') || [];
  }

  async function unfollowAll() {
    const buttons = getAllButtons();

    for (let button of buttons) {
      count = count + 1;

      const name = button.parentElement.querySelector(
        '.follows-recommendation-card__name',
      ).innerText;
      console.log(`Unfollow #${count}:`, name);

      window.scrollTo(0, button.offsetTop - 260);
      button.click();

      await new Promise((resolve) => setTimeout(resolve, 100));
    }
  }

  async function run() {
    await unfollowAll();
    window.scrollTo(0, document.body.scrollHeight);
    await new Promise((resolve) => setTimeout(resolve, 1000));

    const buttons = getAllButtons();
    if (buttons.length) run();
  }

  run();
})();

For people just having this gist link:

Open https://linkedin.com/feed/following/
Open Dev Tools > Console (Cmd+Option+J)
Paste the script & press enter