I call my personal strategy the 3Ds: Distance, Distraction, and Description.
First, I distance myself from my crush. This includes exposure such as social media. I have, in the past, told my crush that I needed time to get over them before I can be in a place to interact with them again. The first time, I never really could and had to cut all contact. The second (and last) time it went well and we were able to continue our friendship for years until life distanced us. It’s all context-dependent, so you’ll have to decide for yourself if you still want to be friends. Otherwise, out of sight and out of mind.
Next, I distract myself. While I still spend time processing my emotions and disappointment, I make sure to do things I enjoy to take my mind off everything. I hang out with friends, play video games, read, watch movies, etc. If not, I will spend whatever idle time I have thinking about my crush, which can make it difficult to get over them.
Finally, description. This one sounds a little weird because I had to use a word to fit the 3D theme, but this one is all about processing. I write about my feelings or talk to my friends/a professional about it. Sometimes, I research other people’s experiences and reflect on how I relate. No matter the medium, I describe what I’m feeling or how I’m hurting. It releases some of that internal pressure I feel and sometimes gives me something I can analyze and understand about myself and my feelings.
Don’t know how much this helps you but everyone’s process is different. As long as you are exploring ways to move on and being mindful of what works and what doesn’t (for you), you’ll get there with time. Good luck and feel better soon my friend!