Psalm 37:4, “Delight yourself in the Lord and he will grant you the desires of your heart”

just means that God will give you actual desires for Him, that through the Holy Spirit, He will fill you with a yearning for His laws and His heart. It doesn’t mean that God’s going to give you everything you want just because you are following Him. Our hearts are wicked. This scripture is referring to the change that God is going to make in our hearts when we follow after Him and delight in following His laws. God is not a genie. He doesn’t grant wishes. His desire is to mold us into the image of His Son, not grant us fleshly desires that fit in with the cravings of this world.