I sold LTC.
BTC is promising now.
It ll have forking,
Free money.
Hold it and later you can buy cheap altcoin from that forking.
Conservative approach.
we never recommended LTC to any of our clients. Atomic Swap and other SegWIT Stuffs were just hype, In long term the altcoin that will stand is ETH , Lisk , XMR.
In as much as we can expect anything huge for any of the altcoins, we cannot really say much yet, can we? I sure know most of these coins you have mentioned will have a chance to grow, but the ocean is large and even ETH is not really giving so much as expected so far.
With the development so far, I hope it does but with a lot of competitors coming up with the same type of project, a lot of work should be done so it does not get overtaken. Litecoin on the other hand is one coin I will just stay mute on for the moment.