Most people here suggesting BTC and ETH as safe bets. While this is a good idea, I would also consider investing ~20-30% on some low market-cap promising alts, such as DeepOnion or COSS, in the circumstance that one of them moons, as well as more well known alts such as ADA or XLM.

Another idea, while more risky, could be allotting another 15% for PnD's, such as this one , which can potentially net 2x, 3x, or even 4x, although the risk is larger, so invest with caution.