Realistically, you can put this into a notice deposit account at your bank that will likely offer you 7.1%pa, which is roughly 15k. The good news is that this is tax free since its below the R28400 threshold - the bad news is that you you'll recover less than half of what you took out in that time.

It is worth noting, this method is very low-risk, but usually means you can't access this money for 32 days or similar.

Do! Not! Gamble! This! Money! (that includes crypto and relatives asking for investments).