First of all, I'm sorry to learn the author got cancer; I wish her all the best and continued strength. Many contributors have already made good suggestions how to reduce the risk of getting cancer, or how to deal with it; but I found most posts quite _technical_. Speaking in general terms, cancer is not a disease like a common cold. The human body sooner or later is bound to decay, which pretty much starts once one…
This common claim that "we need to die to make room for other people" is not obviously true, good discussion here: https://www.lesswrong.com/posts/ufjFuHmJoysXrKXYQ/what-exact...
Also, don't be so quick to accept death as a good thing: https://www.lesswrong.com/posts/Aud7CL7uhz55KL8jG/transhuman.... It's basically the worst thing that can happen.