Have you ever heard someone pray and they repeat the word just so many times it becomes noticeable. For example, Lord, we just ask you to hear us as we pray right now and we just ask that you will be with us and bless us and we just want you to do this and we just ask you to do that and we just thank you and just praise you and we just want to say Amen when the prayer is over.
Why do they use just so much when they pray? Here's a few ideas about that.
"Just" is a term that implies "not much" so it fits well with prayers of petition in helping us convince ourselves and perhaps influence God of the idea that what we are asking for is possible because it's not as big a deal as one might think and so that possibility thinking seeps into our unconscious mind and becomes more likely to manifest.
And yet, all the above may be disregarded as the repeated use of "just" in others becomes a bad habit like a nervous verbal tic in the one praying out loud in front of others as it is used like the repeated use of the word "umm" or "and" by an insecure public speaker.
And yet it has a deeper function, repeated use of "just" serves to subconsciously identify the prayer as being part of our tribe, our religious subculture, our church family, similar to the way people in the Deep South use "y'all" to serve many purposes one of the most important of which is to self identify as a person who is a Southerner, and who is thus more likely to say "just" when she prays and "y'all" to refer to the plural form of "you."
And so you can see that "just" serves just so many functions it would be just dumb to not use it as often as possible especially when leading public prayer in the Southern United States.