I don't know of any way to convince people that we are not alone. I think they need to have direct physical experience with the beings to really know
for sure, and the beings will choose the time and place for that.
Here's a link to a site that may help your understanding a little.
I believe most people are not supposed to know that we are not alone, and governments actively destroy evidence to prove otherwise.
You have a lot to lose by discovering the truth because life as we know it is based on incomplete information.