Some Christians believe God no longer multiplies food, money, or time. Other Christians believe God still does His multiplication-miracle, but that He doesn't do it for them.
Jesus' multiplication of loaves and fish for the Gentiles specifically contradicts this. In Mark 6:34-44, Jesus multiplied loaves and fish for thousands of Jewish people. In Mark 8:1-9, He does the same thing for the Gentiles, thereby showing the miracle of multiplication is for all, not just for a certain group.
We deprive ourselves of the miracle of multiplication by our lack of faith. We don't believe our heavenly Father will provide; so we provide for ourselves to the point that we leave God little opportunity to father us in practical ways. We don't believe in the Spirit's gift of miracles (1 Cor 12:10); so we confine ourselves to the natural and scorn the supernatural.
By faith and in obedience to the Lord, risk, simplify, and give to the point that you need a God Who still multiplies loaves and fish. Then you will see the miracle of multiplication.