Spend some time in prayer throwing out your old worldview and choosing to see the world as God says it actually is.
You might find it helpful to say “I renounce the lie that [my old false belief], and I announce the truth that [truth from God’s Word],” for example:
“I renounce the lie that the unseen spiritual world is not real, and I announce the truth that it is just as real as the physical world we can see.”
“I renounce the lie that financial success brings real security, and I announce the truth that I am already perfectly secure because no one can snatch me out of God’s hand.”
“I renounce the lie that I should be worried that someone may have cursed me, and I announce the truth that I am seated with Christ in the heavenly realms far above all other spiritual powers.”