Verse 21 What peace and praise is made of.

Philippians 4:6-8
do not be anxious about anything, but in everything by prayer and supplication with thanksgiving let your requests be made known to God. 7 And the peace of God, which surpasses all understanding, will guard your hearts and your minds in Christ Jesus.
8 Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence, if there is anything worthy of praise, think about these things.

SIS

Matthew 6:25
Do Not Be Anxious
25 “Therefore I tell you, do not be anxious about your life, what you will eat or what you will drink, nor about your body, what you will put on. Is not life more than food, and the body more than clothing?

Ephesians 6:18
praying at all times in the Spirit, with all prayer and supplication. To that end keep alert with all perseverance, making supplication for all the saints,

Isaiah 26:3
You keep him in perfect peace
whose mind is stayed on you,
because he trusts in you.

John 14:27
Peace I leave with you; my peace I give to you. Not as the world gives do I give to you. Let not your hearts be troubled, neither let them be afraid.

Colossians 3:15
And let the peace of Christ rule in your hearts, to which indeed you were called in one body. And be thankful.

HIJ

Jesus lived a life of prayer, before the choice of disciples, during the temptation in the wilderness, before the cross, to cite just a few. If the very Son of God needed prayer, and time with the Father, surely we do too.
Also what sums up Christ more than what is listed in verse 8, seven items enough for one a week.
Keep short accounts with Him, don't store up for the end of the week say. As you see something praiseworthy of God, pause and worship or give thanks. And yes prayer is for your requests, God is there to keep you. But He is not there for gimme, gimme. It is there so we can get peace by,
1 Peter 5:7
casting all your anxieties on him, because he cares for you.