Forgot to submit the request for fee reduction when submitting the patent electronic application. Can I withdraw my new application?

You can withdraw it actively or passively. Failure to pay the fee within the prescribed time limit shall be deemed as withdrawal. If you want to keep the original application date, ask for priority when reapplying. It's best to leave it alone and reapply. Because the patent office will not review it without paying the fee. I'll send you a cancellation notice then. Don't worry, I've done it.