It's simple. Simply immigrate to Earth. There will be inevitable resistance to alien invasion by "hateful far-right reactionaries", but simply say that you're there for a better life for yourself and your species, and leftists will defend you. Co-opt civil rights groups to campaign for "alien rights", eventually gaining state benefits. Make sure to commit terror attacks to kill a few resisters, but only enough to cause more of a backlash among right-wingers. Despite the fact that you obviously look and behave differently to humans, make sure any research that demonstrates any differences is suppressed. Convince the population that there is a "rise in far-right radicalization and hate", and use that to censor any reasonable voices who object to alien invasion.

Eventually you will have enough rights and institutional power to start directly advocating for the invasion. At this point, start tearing down monuments to humans, claiming they are hateful because the humans are bad as evidenced by their history of violence. As the number of aliens on the planet rapidly increases, start persecuting humans who dare to speak up in their own interest. Their time is over. For the planet, aliens are a source of our strength.

Once you have full institutional control, begin to eliminate the last traces of human resistance. At this point there are no human organizations that can act together to resist your invasion, so it's only a matter of time before you win. Confuse the remaining humans by calling their theory of "alien invasion" a "conspiracy theory" and "something that Hitler would have supported". Then shoot them in the head with a phase blaster for committing anti-alien hate crime. All the humans who helped you along the way may now be targeted without resistance. Line them up against the wall and shoot them.