Our God is a Mighty God and He already secured victory over the enemy when Jesus died on the cross. He has saving power that He provides for us day in and day out.
Life is full of ups and down and it is normal to go through seasons of confidence and seasons of doubt. When God does something great in your life, make a note of it so you can look back to it in your low moments when you feel away from God. Remembering those moments that you felt close to Him with bring you back to Him and that closeness we all prefer.
God is with you always. He has done wonderful deeds. Be thankful for all He has done for you and give Him praise. He will humble you in your ups and He will comfort you in your downs. Be thankful He is there, no matter what season of your life you are in. And always remember His saving power.