All the doors of Paradise are opened for the believer who makes wudu perfectly and then recites the shahadah. Therefore our du’as at this time have a greater chance of being responded to.
The Prophet, peace and blessings of Allah be upon him, said:
“There is no one amongst you that makes wudu, and does so perfectly, and then says, ‘I testify that there is no deity worthy of worship except Allah. He is alone, having no partners. And I bear witness and testify that Muhammad is His slave and messenger’, except that all eight doors of Paradise are opened for him, and he can enter into it through whichever one he pleases.” (Recorded in Muslim)