1) Express: All the pain you feel, let it out - cry, scream, punch, shake your body - it is all energy which needs to be released from the body and will help your healing
2) Process: If you are no contact with your ex, write down in a letter (with a pen on paper, not a keyboard) everything you wish you could say to your ex. Then, once it’s all out - destroy it.
3) New: Remove familiar things of your relationship out of your home. Rearrange the furniture in your bedroom and buy some inexpensive home furnishings to change the aesthetic of the room. Start a new hobby, visit new places and start listening to new music you haven’t tried before.
4) Play: Don‘t avoid pain but do distract from it sometimes - be around funny and pretty places people and things (these things were joyful regardless of your ex and they will be joyful again for you soon)