Reducing carcinogens would reduce the cancer rate a bit. Banning smoking completely would probably be the best first step. But most of the items on your list are either already heavily regulated (radioactive elements, food and water) or don’t actually have any impact on cancer rates (the list of radio spectrum parts)

Also you’re lying to yourself if you truly think that getting rid of modern advances all together would eliminate cancer. Cells sometimes mutate when dividing and in a fraction of those cases it leads to cancer. That’s life. There will always be a chance of that.