To keep free funds without investing them is inefficient approach because your money then does not earn anything. In order to boost your capital, there are very wide opportunities for investments.
Before you make any investment, it is important to decide whether you wish to make a safe and stable investment even if interest gained does not exceed the inflation rate or you wish to make an investment into investment funds which usually experience long-term yield rates that pace out the inflation rate and give real profit to their investors. However, one must keep in mind that investments into funds are associated with a certain level of risk because yield rates are not guaranteed and profits of investors depend on price fluctuations of securities in which investments are made.