Breath. The most important thing is to relax. If your muscles are tense, getting the cup out is even harder.
When removing the cup, always remember to use your own muscles. Push the cup down with your pelvic floor muscles like you’d be pooping until you can get a firm grip from the bottom. Pinch the bottom with your fore finger and thumb to release the suction. Then keep pushing while slowly pulling the cup out. You can also rock it from side to side. You can fold the cup a bit with one hand by grabbing the cup with fore finger, middle finger and thumb. Place the fingers around the cup and push your thumb between the fore and middle finger. That way you kinda fold the cup as c-fold and it is easier to get out :)
You can also try this trick: slide your finger amongst the side of the cup (your finger between the cup and vaginal wall) and bend your finger when you reach the rim.