Thank you for your replies, your opinions help me get a better perspective on the market.
Initially, when I entered the market, I was only interested in BTC, LTC and ETH, and my plan was to invest a (very) few $k and forget about it for 5 years, accepting whatever state they'll be in when I return to them.

However, with the recent turn of events in the market, I found myself invested double the initial plan (still just a few $k), in 20 different coins, reading non-stop, and just being involved hours daily.

I think, taking your opinions into account, a good strategy will be to dilute my holdings in the most profitable alt-coins (except ETH and LTC). Say, to sell an amount equalling to double or treble my investment on the coin, and leave the rest to freeroll for 6-12 months.