There are so many races and nations out in space, most able to reach earth. But through official denial and human aggression they need to work in silence. You won’t have many friends, if you shoot first and talk later. Especially the artificial paradigm of degraded technology on earth is a huge problem to work with races that had evolved much higher. Many of this races has ambassadors and speakers on earth, complete open to view. Some already rule countries and governments with the hidden hand.