i have, bitcoin,ethereum, litecoin, bitcoin cash,ripple,dashcoin and dogecoin. 
Stick to that if that is passed your criteria and requirements that those listed coin of yours is good for long term holding.
I think any holding coins before 30 September is risky
But if u need u can go for ETH it will be @500$ soon
But if u need u can go for ETH it will be @500$ soon
Anytime of the day, holding coins is risky as anything, positive or negative can happened. Remember that no one knows what will happen tomorrow so hold at your own risks.