Put on salvation as your helmet, and take the sword of the Spirit, which is the word of God.

Every fiery dart can be extinguished with the water of God’s promises

Fear of missing God’s will: - Exodus 15:13 NLT - "With your unfailing love you lead the people you have redeemed.

Fear of judgement1 John 4:19, Such love has no fear, because perfect love expels all fear. If we are afraid, it is for fear of punishment, and this shows that we have not fully experienced his perfect love. 

Fear of lack– Philippians 4:19 NLT - And this same God who takes care of me will supply all your needs from his glorious riches, which have been given to us in Christ Jesus.

Find the triggers of fear in your life and treat them with the truth of the love of Father God. In other words, go to the promises of God rooted in His perfect and unfailing love to extinguish the fiery darts of the evil one. There are 3 examples outlined above but there are many more.

What is it that makes you most afraid?  Find out from God’s word that He has provided an answer.  If you do not know the bible so well, ask a mature Christian friend.