A spirit of Mars can help with training, and maybe bring you better opponents. The better class of fighters you beat, the better your chances of getting to the upper tiers.
You also need to cultivate an image that will draw in sponsors, because that is what brings in the money, not the actual sport. Mohammad Ali was billed as the “best,” Rhonda Rousey sold the image of being “unbeatable,” Oscar De La Hoya was a “local boy made good.” They all created images that had appeal and so sponsors were lining up for them.
Decide on an image, a character, to play, and start programming that in to your aura. Call upon Venus to build the charisma you will need.
To get where you want to go is going to take a hell of a lot more than just one demon or god because there are many many moving parts required. You really need to put in some serious thought about what kind of image you want to be known for because being a “good” fighter is nowhere near the level you need to be at to become wealthy or famous as a boxer. There are thousands of good fighters, but there are only maybe a few hundred great ones, and of those, only a handful are famous enough to be household names.
Decide who you want to be. Work on your skill. Choose the image you want to project. Create a plan and follow it. If you don’t have a plan, then wealth and fame will never be achieved.
You could try calling upon Lae’ti’kohl, from The Book of Azazel, to help you build a plan, and she can instruct you in what you must do to bring your plan to pass, but the one thing you have to understand is it is not a one and done kind of thing, nor is it instant. You’re looking at years of hard work, even with the plan and the demon’s aid. It won’t be easy.