Joy is not a luxury option; joy is your constant! Your union in the Lord is your permanent source of delight; so I might as well say it again, rejoice in the Lord always!

Philippians 4:4

If you ever think that joy is an option for your life, Paul has another thought for you. We can’t discount the thing that Jesus endured the cross for as unnecessary or optional.

Look away from the shadow dispensation of the law and the prophets and fix your eyes upon Jesus. He is the fountainhead and conclusion of faith. He saw the joy (of mankind’s salvation) when he braved the cross and despised the shame of it. As the executive authority of God (the right hand of the Throne of God) he now occupies the highest seat of dominion to endorse man’s innocence! (Having accomplished purification of sins, he sat down. [Heb 1:3, Isa 53:11])
Hebrews 12:2 Mirror

You can’t opt out of joy. You can’t pick and choose joy. You can’t disallow one third of the foundation of God’s kingdom.

For the kingdom of God is not a matter of eating and drinking but of righteousness and peace and joy in the Holy Spirit.
Romans 14:17 ESV

Everyone understands that righteousness is a key part of the kingdom. Everyone hopes for peace to cover their days.

But, we don’t expect the same from joy.

If you are lacking in joy then you are lacking in the kingdom. But, don’t feel condemned, remember that you’re surrounded by it. Embrace it. Receive it. Believe it.