You can use this script with a browser addon like Tampermonkey to get around the sign-in requirement:

// ==UserScript==
// @name         reddit - unblock (create cookie and reload)
// @namespace    Violentmonkey Scripts
// @match        *://*.reddit.com/*
// @grant        none
// @version      2024-01-08
// @noframes
// @license      MIT License
// @description  for "Blocked" "whoa there, pardner!" cowboy bs
// ==/UserScript==
/* thanks: https://www.reddit.com/r/mullvadvpn/comments/18jbxb2 */
if (document.title === "Blocked") {
  document.cookie="reddit_session=;Domain=.reddit.com;Path=/;Expires=;Secure=true;SameSite=None";
  window.location.reload();
}