Returns of your investments doesn't only depend on the capital you are willing to invest. The risk of asset(s) you are going to invest into is important, too.
I.e. at the moment you won't get rich (quick, or in finite time) with invests into german bonds, while you may get rich by investing the same capital into riskier assets like cryptocurrencies or p2p-lending.
Notice: Higher risk for (total) loss of your investment means potentially higher returns.