Put it into Bitcoin and hold. Any altcoin investments are risky. You need to research them before going in. As for next I would suggest you stay away from that. The distribution of coins is poor.

https://nxtblocks.info/#section/blockexplorer_distribution - 2487 Next addresses hold 98.77% of all coins

https://bitinfocharts.com/top-100-richest-litecoin-addresses.html - 15076 Litecoin addresses hold 95% of all coins

http://bitcoinrichlist.com/charts/bitcoin-distribution-by-address?atblock=350000 - 123083 Bitcoin addresses hold 97% of all coins