The Real intent of prayer is not what it does for you but what it does in you.
As there is a lot to learn about prayer, there is also a lot to unlearn. Do not pray like the hypocrites who pray to be seen. God who sees in secret rewards openly.
Understand that even conversations that happen in a secret place have an open reward. Do not use vain repetitions (Matt 6:7-8 ) Jesus emphasized importunity in prayer. However, the difference with vain repetition is in the motive Not all repetition is vain Eg Worship (Rev 4:8 ) and Prayers of Consecration.
Things you contend for in warfare follow naturally a man of intimacy. Have the right focus in prayer.