First let us ask what do we invest ? we invest our time, money, effort, devotion,talent,emotion etc.
Now let us ask where do we invest those or any of those ?we invest those on say education, business, family, relationship, occupation, leisure, you name it.
Where can we have the best return for our investment ? I believe the best return , even more than we give is to invest or focus on the kingdom of God or seek first the kingdom of God and its righteousness, for God says all your needs ( not wants) will be met.