How do you ween off caffeine before Yom Kippur?

I know this is a little more light hearted than many of the posts in recent times but I think this is something many of us can relate to. This year I’m trying to stay away from caffeine before Yom Kippur to see if it helps with the fast. It’s been 36 hours off caffeine and I already have a headache. :( Any tips from those that do it each year? Thanks for the help, hope everyone has a Shanah Tova!