The best way to get over a crush is to start focusing on yourself.
Find activities you like to do, find friends you enjoy spending time with, try out some new social hobbies, expand your social circle.
When you are busy living a life you enjoy, you will get over your crush.
All the things I mentioned will be fun, expose you to meet more people who may have a romantic interest in you. Plus you might have fun stories out of these adventures.
Build a passion for life and you will get over your crush.
Hope that helps.