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Depends what your goals are?
Just like he said, it really depends on your goals and how much time you have.
Some of the currencies you're holding have comparatively small market caps and are still trading under $2, (XLM, ADA, TRX), they all have the potential, in the short run, to 4x/5x any investment you make, short run being anything under 12 weeks.
Long term investments can depend on for example, the idea behind the coin, the problem it's trying to solve, how qualified and committed the development team are, how much investment has gone into the coin, if the currency is community backed, so on and so forth.
In my opinion, the coins that you're holding now that are long term investments, are LTC,XMR,QTUM, I also think you should purchase XRP has the greatest potential for 2018. These are coins that already have large market caps and higher values per coin, they are more established coins and are relatively safer investments, fro 6-12 months.
Do your research, educate yourself, invest wisely not blindly.