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If I stop drinking does that decrease risk of cancer?
Don’t take this the wrong way, but if you’re worried about getting cancer from 3-4 drinks per year, it sounds like you might be dealing with a fair bit of anxiety.
Stress caused by anxiety is bad for your health and a possible cancer risk, and almost certainly worse for you than 3-4 drinks a year. I don’t want you to now be anxious about your anxiety, but this might be a good thing to focus on to improve your general quality of life (and possibly reduce your cancer risk in the process).
You could start by talking to a doctor or other medical professional about it, or try finding a therapist in your area. The therapist search on https://www.psychologytoday.com/ is a good place to look, or try an online service like Better Help.
[edit: corrected overstatement about stress being a major cancer risk]