“This I declare”, some definitions are “to say in a solemn and emphatic manner, to state without hesitation, to swear. My favorite definition is “to broadcast.”
This I broadcast
“about the LORD”: The LORD —Master or Ruler
“He alone is my refuge.” Refuge—a condition of being safe & sheltered from danger. The place that I run to when the storm or trial is hitting. The place I can go for shelter from pursuit, danger or trouble. A place of security.
“my place of safety.” safety—the condition of being protected from risk, injury or harm. A place where I am protected from harm. A place I can be at ease because I trust where I am.
“He is my GOD.” GOD—The Creator & Ruler of the universe. The Supreme Being. He is worthy to be worshiped. There is no one above Him. my GOD—I am claiming Him as my GOD, belonging to me. I have a personal relationship with Him.
“And I trust Him.” Trust—firm belief in the reliability, truth, strength or ability of someone or something. To be certain, assured, and convinced. To know that He can be relied upon. That He is my protector and I am His charge. He keeps me & cares for me. He has full custody and I know I can depend on Him.
So my version of Psalm 91:2 is:
I broadcast this about the LORD: He alone is my security and my place where I am protected from harm. Where I can go to cry and laugh, to be myself. I will run to no one else. He is my GOD, The Creator of all & is above all things. He has sole custody of me. He lovingly cares for & protects me as His charge, as His child. I have firm belief that He is not only able but He is willing and is always in the process of caring for me. I rely on Him. I am certain that my hope & trust is in the right place. In my GOD.
He is your GOD too when you believe in His Son Jesus. Some helpful verses to learn more—John 3:16, Romans 3:23, 6:23-24, 5:8, Romans 10:9-13, Acts 16:30-31