What does ‘my reward is with God’ really mean for hard work and profit?

The bible says, surely I have laboured in vain, yet my reward is with God.

What I believe is that God is talking about profit change in that bible verse.

Like God took all the effort I put into my book ideas and he converted it into religious knowledge.

God can take your efforts at fitness and convert it into a professional reward through improved money making power.

God can take all your efforts at caring for family and convert it into a health boost where you become healthier than you were before.

This is why the bible says all hard work brings a profit.

God can convert one type of reward into another type of reward so that no hard work goes without reward.

What does ‘my reward is with God’ really mean for hard work and profit?
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