Prayer is not crucial because it changes God, but because it changes me. When I pray, I see things more clearly, understand concepts that I never did, and begin to understand what God's will is for my life.
When I pray, sometimes, I feel like I am right and am confident in that area. Or, when I pray, I feel convicted that I am wrong.
I am going to give several links and I hope they help:
https://iluvbingjcsbride.blogspot.com/2016/02/prayer-how-we-view-god-when-we-talk-to.html, https://iluvbingjcsbride.blogspot.com/2014/01/what-life-should-look-like-truth-behind.html, https://iluvbingjcsbride.blogspot.com/2016/05/many-days-come-to-pass-but-this-has.html, https://iluvbingjcsbride.blogspot.com/2016/07/listening-to-advice-from-above-how-to.html, https://iluvbingjcsbride.blogspot.com/2016/05/war-vs-peace-how-all-this-time-jesus.html, https://iluvbingjcsbride.blogspot.com/2016/07/my-peace-is-your-peace-jesus-how-to.html, https://iluvbingjcsbride.blogspot.com/2016/05/adultery-vs-idolatry-how-to-avoid.html.
I hope this helps you understand where I am coming from regarding prayer. Talk to God in prayer and love on him like you would your husband.
Praying for you. http://shorelinechurch.org/sermon-videos/?enmse=1&enmse_tid=49&enmse_mid=129.
Happy New Year!