To answer your post, I've seen different things people do to raise energy in order to cast. Some people dance, play an instrument, act out a certain scene of their desire or move their body in a rocking formation while clapping/rubbing their hands together while visualizing the outcome of their desire.
So why not try sitting on the floor, preferably in the dark, relax yourself and let your body just rock. Back and forth or side to side or even in a circle. As your body moves, visualize what you desire and maybe clap or rub your hands together as well to receive more energy through them. Keep your desire strong in your mind, if you want to chant something then chant whatever comes to mind and feels right. Do this for as long as you feel is necessary and until you feel you've raised enough energy to manifest the desired outcome; once you feel you have just throw your hands up and feel the energy being sent out.
If you feel a little tired after, then it's ok it happens. Just ground yourself after, but it would be good to ground yourself before doing this; then again, it's up to you. For grounding techniques, you'll find a number of articles on it in the article section. Good luck.