i would say convert your coins to NXT.
Of course you would.
OP, I'm not a speculator, so I have an hard time advising you. However be careful with "coin shills". They abound in Nxt and Doge, they are prevalent in a few others.
Perhaps, the other advise is fine: 50% on BTC, 50% on alts. Or other distribution, 70% BTC, 30% alts, etc... Nobody forces you to keep exactly the alts you hold now, though. You can always sell them all and buy other set of alt coins with part of the total BTC. Including even Nxt and Doge, not saying otherwise, but perhaps learn some context and understand if it's the best for YOU.
Be careful if you end up holding coins that have no volume or have low network hash. They can be unlisted from exchanges or otoh can be 51% attacked and forked.