Offer praise to God whenever you feel vulnerable.

Psalm 28:7

The Lord is my strength and my shield; in Him my heart trusts, and I am helped; my heart exults, and with my song I give thanks to Him.

If you put your faith in God’s Word & declare it as truth, it will be your shield & defence

Ephesians 6:16 

Lift up over all the [covering] shield of saving faith, upon which you can quench all the flaming missiles of the wicked [one].