Seeing Imam Zaman (AS) is not a matter which can be achieved by just Du'a, but it needs purification of heart and deeds to reach to real piousness. Real pious servants of Allah,v can see Imam Zaman (AS) because of their continue piousness.
Do more good deeds like Reciting Quran, giving Sadaqa, helping in good cause, etc) and gift the reward to Imam Zaman. This can make us more near to him (AS).
Wassalam.