How can the court protest without informing the victim that the trial result has expired?

You can also continue to protest, because according to China's laws, the protest of criminal cases is not limited by time, and there are protests of second instance and protests of trial supervision procedures. You can now carry out the trial supervision procedure, file a complaint with the procuratorate and ask it to protest. If necessary, you can consult the CSRC. I hope the above reply is helpful to you.