Jesus encouraged persistence
Jesus taught his disciples to keep bringing their needs to God. In Luke 11, a man goes to a neighbour at midnight asking for bread and does not give up when the door is closed. Jesus then urges his listeners to ask, seek, and knock (Luke 11:5-10).
The point is not that God is unwilling and must be worn down. Jesus had just taught his followers to call God Father. Persistent prayer rests on the confidence that God hears his children, even when the answer has not yet appeared.
And I say unto you, Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you.
Not empty repetition
There is a real difference between returning to God and repeating words without thought. Jesus warned against prayer that piles up phrases as though the amount of talking could make God listen. The Father already knows what his children need before they ask (Matthew 6:7-8).
So you do not need to find a perfect sentence or make a request sound more convincing. You can pray simply: for healing that has not come, a fractured relationship, work, guidance, or courage for today. If it still matters, it is still worth bringing to God.
But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.
Jesus and Paul prayed again
On the night before his crucifixion, Jesus prayed in Gethsemane about the suffering ahead. He returned and prayed again, bringing the same sorrow to his Father while submitting himself to the Father's will (Matthew 26:39, Matthew 26:44). Repeated prayer and surrender belong together.
Paul also asked the Lord three times to remove what he called a thorn in the flesh. God did not take it away, but answered Paul with grace sufficient for his weakness (2 Corinthians 12:8-9). Sometimes God grants the request. Sometimes he gives sustaining strength in the middle of it.
And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.
Pray openly while you wait
Keep speaking honestly to God. You can thank him, ask again, admit your disappointment, and ask for wisdom to recognise the next faithful step. Repeated prayer is not a way to control God. It is a way of staying close to him with what is real in your life.
Paul encouraged believers to bring every concern to God with prayer and thanksgiving rather than being ruled by anxiety (Philippians 4:6-7). Ask more than once if the need continues. Then watch for God's provision, direction, peace, and strength, and keep reading Scripture as you wait.