As I work through my regular Bible reading, I pay especially close attention to the ways God is described. God is universally described in ways that no other being could be. This helps draw us in to be impressed by His uniqueness, His aseity. You don’t have to necessarily do anything different, just pay more attention to God’s attributes, His character, or His works. 

Read through the Psalms in particular, and be impressed by the One who owns the cattle on a thousand hills (Ps. 50:10). Be in awe of the One who resides on His throne and laughs at the feeble attempts of opposing powers (Ps. 2). Be astounded at the One from whom you cannot escape, Who knows every intimate detail about you and your innermost self (Ps. 139). This could be said of God and no other. This is the uniqueness of Yahweh, the true and living God. 

All of this is introduced in the Pentateuch and then built out as you read the rest of the OT. Yahweh is the only being who could speak the world into being. When He speaks everything responds. We tend to focus on His power, might, or some other feature of His being, but this is about His holiness. If you are looking to be impressed by the greatness of our holy God, then you will start seeing it on every page of Scripture.