So I've been working out for 4-5 years now and decided to start an anavar cycle soon but I'm unclear as how to figure out the best diet. Do I stick to a 45p 40c 15f? Im 165lb 5'10, and around 19bf%

I want to lean out but at the same time I worry that I don't have enough muscle mass. Should I change my diet during the cycle or is there not enough time to switch from a cutting diet to a lean mass diet? I'm confused any help would be greatly appreciated.