Your provident fund has a lot of SA exposure already. So I personally would look at offshore exposure:
90% STXWDM - tracks the shares of the developed world (USA, Europe, Japan etc). Solid long term investment unless the world goes to shiaat.
10% STXNDQ - tracks the top 100 Nasdaq shares (Facebook, Google, Microsoft, Uber etc). Potentially very good growth (or terrible).
Over 5+ years that should deliver decent returns (DISCLAIMER: I won both).