2 Chronicles 7:14 if my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then I will hear from heaven, and I will forgive their sin and will heal their land.
In order for God to heal us, we need to humble ourselves, sometimes it is because of pride, the Lord allows sickness to humble us. We need to seek His face, seek His presence. We first seek His face, seek His presence before seeking His healing. Seek His face, seek His presence is the most important thing. Some sickness are because of sin, some are not. We need to confess our sin, repent our sin in order to get healed.