How can Christ’s death on the cross be sufficient for salvation when Paul speaks of what is lacking in the sufferings of Christ?

Colossians 1:24 "Now I rejoice in my sufferings for your sake, and in my flesh I am filling up what is lacking in Christ's afflictions for the sake of his body, that is, the church."

Just what is lacking in Christ’s afflictions (Colossians 1:24)?

Colossians 1:24 - 2:5

ESV - ²⁴ Now I rejoice in my sufferings for your sake, and in my flesh I am filling up what is lacking in Christ's afflictions for the sake of his body, that is, the church. ²⁵ Of which I became a minister according to the stewardship from God that was given to me for you, to make the word of God fully known.

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