Welcome to Spark! There are a lot of tools and resources available here to help us on our journey; my favorites are the fitness and nutrition trackers because the keep me on track and accountable every day. But the best part of Spark is the community, the people here are amazing!
It's great you are wanting to focus on your health, what a difficult year you've had, but sounds like your cancer was caught early and treatment is going well...as well as chemo can. Hang in there, 4 more treatments and then the body can begin to rebuild and your journey to good health and fitness can really begin. Your positive attitude will continue to help you reach all your goals.
Keep your goals in focus, put in the work and you will succeed!