Jesus told a story (Luke 18) of a woman so passionate about wanting justice she succeeded in getting her way simply by annoying the Judge who could solve her problem until He finally relented.
Our Father is a lot more willing to act than a reluctant Judge, but Jesus used this story to illustrate the importance of not giving up when prayers aren’t answered immediately.
It’s ok to ask, ask again, and keep asking God until we see a change.
Are there specific things you want to persist in asking for? Is there something you look at several times a day like a mirror, window, computer screen or phone? Write a note and stick it where you’ll see it most as a reminder to pray.