bitcoin and eth.
you can see for yourself how the development of their price since 1 month ago until today. if you want to find a short-term investment, now is the right thing to start at bitcoin. and I think the bitcoin and eth prices will continue to increase.
Check for the forks that are expected and buy this cryptocurrency several days before the event.
You can try buying now Ethereum Classic and Ethereum. Waves is also a good crypto for short-time investment.