Steven, you don't have to make contact with the wrong aliens. As a Sovereign Being endowed with freewill, you are fully in control of what happens in your life; and you can use your freewill to control what can enter your living, working, and/or playing space.
So, to attract good aliens you can say something as simple as, "as a Sovereign Being, I'm using my freewill to attract and communicate only with aliens whose work is for the greatest good and benefit of all involved. Aliens who take advantage of others, lie, cheat or are not truthful are not welcome in my house, space...".
The key words are Sovereign Being, and freewill. You got to understand and believe in them.