What should I do if the criminal detention has not been held for more than a year?

Criminal proceedings should generally be completed about half a year after arrest (conclusion). You have been detained for more than a year, which means two things:

First, the case is very complicated, such as group crime (especially fraud group), and the limitation of action is recalculated due to supplementary investigation or discovery of new criminal acts.

Second, it is a criminal case that can be severely punished (can be sentenced to more than 10 years in prison), and the time limit for investigation and prosecution has been extended with the approval of corresponding procedures.