Psalm 37:4 is not a promise that God will give you whatever you want but it is a promise that as you seek God with all your heart and delight in Him in His presence, then He promises to fill your heart’s desires because you will want what He wants. Your desires will match up with God’s.
And we pray:
Holy LORD, God of our fathers and great Giver of every perfect gift, thank You for longing to bless me and I pray that Your Essence pour the riches of Your grace upon me. Please touch my heart to desire Your will and then to boldly ask you to accomplish it to Your glory. In Jesus’ name, I pray. Amen.