R’ Schachter from YU understands the concept of ayin hara in a much more rational way. He explains based on the pesukim that talk about if someone takes advantage of a widow or an orphan and they pray to G-d, then G-d will avenge them. I think Rashi asked why is it necessary for them to pray for G-d to act with justice? Rashi explains that G-d will punish the sinner anyways, but he is quicker to respond when there is tefilah.
Based on this, R’ Schachter explains that an ayin hara is simply a tefilah that someone shouldn’t have something. For example, if a person sees someone who has a nice house and complains (even in his heart) that he doesn’t think this person deserves that house, then if he truly doesn’t deserve the house, Hashem will take it away. It could be that Hashem was going to give this person time to “earn” the house, but He is quick to respond to tefilah. However, if the person truly deserves the house, then no amount of tefilah or ayin hara can take that away from him.
Based on this, the way to get rid of an ayin hara is to do teshuvah, daven, and learn Torah.