Once you have a ritual, the other key is consistency. We like to superstitiously repeat the same ritual that worked before because we want the same results. I can’t explain the rationality behind it, but it’s just part of telling yourself to focus on what’s ahead and prepare for it.
The key is spending some time introspecting to find what works for you. Personally, I found standing outside by myself for a few minutes and taking some calm, deep breaths while soaking in the sights/sounds from the environment around me to work better for me than listening to music. But that’s just me, other people could have a totally different way that works for them.