This post will contain a tip on how to increase your CPF returns, namely in the form of interest.
One way to earn more interest from CPF is to transfer your extra money, into your CPF Special Account.

The choice between CPF or Fixed Deposits is determined by how much flexibility you want.</span>
The less flexible the option, the higher the interest.
Your Ordinary Account (OA) currently earns 2.5%, Special Account (SA) and Medisave Account (MA) earns 4% interest while your normal bank Fixed Deposit (FD) earns less than 2% annually.

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If you want to be able to touch the money (to spend or to do other things), putting it in a Fixed Deposit ensures that you will be able to use the money when the situation arises. 
Of course, this would mean you will be getting …