Here's what I learned when I cancelled mine: when you cancel, you will still have full use of Prime benefits for the time remaining until the subscription runs out. So if you really want to cancel, there's no reason not to just do it now. You'll still be able to use Prime until April regardless.

In other words, you can cancel the renewal without cancelling the current year

Yes. I have a problem with verbosity, and you said it with much greater clarity and brevity than I managed. Thank you!

I have the same problem. It's far easier to summarize what someone else than to do it yourself.

You're quite welcome!