If you are unsure of what to pray, remember that revival starts with repentance - personal and collective.  Scripture provides a couple wonderful examples of prayers for such repentance.

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Prayers of National Repentance:

 

“O Lord God of heaven, the great and awesome God who keeps covenant and steadfast love with those who love him and keep his commandments, 6 let your ear be attentive and your eyes open, to hear the prayer of your servant that I now pray before you day and night for the people of Israel your servants, confessing the sins of the people of Israel, which we have sinned against you. Even I and my father's house have sinned. 7 We have acted very corruptly against you and have not kept the commandments, the statutes, and the rules that you commanded your servant Moses. 8 Remember the word that you commanded your servant Moses, saying, ‘If you are unfaithful, I will scatter you among the peoples, 9 but if you return to me and keep my commandments and do them, though your outcasts are in the uttermost parts of heaven, from there I will gather them and bring them to the place that I have chosen, to make my name dwell there.’ 10 They are your servants and your people, whom you have redeemed by your great power and by your strong hand. 11 O Lord, let your ear be attentive to the prayer of your servant, and to the prayer of your servants who delight to fear your name, and give success to your servant today, and grant him mercy in the sight of this man.”

Nehemiah 1:5b-11a  (ESV)

 

“O Lord, the great and awesome God, who keeps covenant and steadfast love with those who love him and keep his commandments, 5 we have sinned and done wrong and acted wickedly and rebelled, turning aside from your commandments and rules. 6 We have not listened to your servants the prophets, who spoke in your name to our kings, our princes, and our fathers, and to all the people of the land. 7 To you, O Lord, belongs righteousness, but to us open shame, as at this day, to the men of Judah, to the inhabitants of Jerusalem, and to all Israel, those who are near and those who are far away, in all the lands to which you have driven them, because of the treachery that they have committed against you. 8 To us, O Lord, belongs open shame, to our kings, to our princes, and to our fathers, because we have sinned against you. 9 To the Lord our God belong mercy and forgiveness, for we have rebelled against him 10 and have not obeyed the voice of the Lord our God by walking in his laws, which he set before us by his servants the prophets. 11 All Israel has transgressed your law and turned aside, refusing to obey your voice. And the curse and oath that are written in the Law of Moses the servant of God have been poured out upon us, because we have sinned against him. 12 He has confirmed his words, which he spoke against us and against our rulers who ruled us, by bringing upon us a great calamity. For under the whole heaven there has not been done anything like what has been done against Jerusalem. 13 As it is written in the Law of Moses, all this calamity has come upon us; yet we have not entreated the favor of the Lord our God, turning from our iniquities and gaining insight by your truth. 14 Therefore the Lord has kept ready the calamity and has brought it upon us, for the Lord our God is righteous in all the works that he has done, and we have not obeyed his voice. 15 And now, O Lord our God, who brought your people out of the land of Egypt with a mighty hand, and have made a name for yourself, as at this day, we have sinned, we have done wickedly.

16 “O Lord, according to all your righteous acts, let your anger and your wrath turn away from your city Jerusalem, your holy hill, because for our sins, and for the iniquities of our fathers, Jerusalem and your people have become a byword among all who are around us. 17 Now therefore, O our God, listen to the prayer of your servant and to his pleas for mercy, and for your own sake, O Lord, make your face to shine upon your sanctuary, which is desolate. 18 O my God, incline your ear and hear. Open your eyes and see our desolations, and the city that is called by your name. For we do not present our pleas before you because of our righteousness, but because of your great mercy. 19 O Lord, hear; O Lord, forgive. O Lord, pay attention and act. Delay not, for your own sake, O my God, because your city and your people are called by your name.”

Daniel 9:4b-19   (ESV)

 

Printable version of the above prayers. 

 

and God's Promise to Solomon:

"if my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land."

2 Chronicles 7:14   (NIV)