Isaiah 43:26 Put Me in remembrance [remind Me of your merits]; let us plead and argue together. Set forth your case, that you may be justified (proved right).
When you pray for something once, God heard you and He answers you. You must then stand on His word by putting Him in remembrance of what it is that He’s promised you and what it is that you’ve prayed for. It’s not that God forgets, but you must be diligent and consistent.
You don’t have to pray for things more than once. Once you pray, you then thank God for what it is that you’ve prayed for by reminding Him of His Word to you. That’s what Jesus means when He says to knock and keep on knocking. The first knock is to establish the fact that you’re there. Every knock after that is a reminder, not an introduction. To pray from something more than once is unbelief. You pray once and everyday thereafter you thank God for it.
What does standing on God’s Word mean? It means that you send a reminder to the heavens and to every enemy that God will come through and if He said it, you must believe it, and that settles it.