Start by being grateful for your crush. Even if they don't feel the same way about you right now, there are still things to be grateful for. Be grateful for their kind smile, their sense of humor, or their intelligence.
Visualize yourself with your crush. Picture yourself spending time together, laughing, and having fun. See yourself in a loving relationship with them.
Write down your gratitudes. Every day, take some time to write down the things you're grateful for. This could include your crush, but it could also include other things in your life, such as your family, friends, health, or home.
Be kind to yourself. Don't put too much pressure on yourself to manifest your crush. Just focus on being grateful for what you have and visualizing what you want.