I am also glad that some of my altcoins are growing well despite the fall of bitcoin.

In this time, when the exchange rate of all cryptos is uptrends, I think ADA is the most potential coin. I pick Cardano (ADA) because I believe that ADA will go to the moon in the next 8 months. This charts of ADA show that the peak of rate was in January 2018, it was $1.28, and next 8 months, it is going to reach at $2 of the exchange rate, make the new record of ADA in cryptocurrency market.

Every coin will boom now, because as you already said all coins suffered huge dump from the beginning of 2018, till about a couple of weeks ago.
But some coins will boom more than expected in 2018 IMO. Currently I'm following IOST, ETN, INSN, EOS, ADA, LYMPO, ETH, TRX and so many other good coins/tokens.

Lets see how far it goes.

My number one pick is BERRY from Rentberry which is disrupting the long term rental (worth trillions) and deposits (worth billions). It's a utility coin that works within an ecosystem that for the first time brings all of the resources a landlord and tenant need all in one place. It's one of the most undervalued coins right now, which is partly because it's only available on hitbtc and Idex. As soon as it hits a bigger exchange it's going to take off. Currently its value is way below what was paid for during the ICO (around .34 cents) and the $30 milllion raised divided by the amount of coins available (300 million) gives you .10 cents a coin and right now it's selling for .05 cents. This should easily double in the near term because there are a lot of bag holders and should be way more valuable long term. The team is a seasoned group that is working toward the app release and they already have a working product that is bringing in revenue. You can see this yourself at their site http://rentberry.com

https://coinmarketcap.com/currencies/daneel/
This one.

If this project has real prospects, then we can see these results soon. I would gladly take part To spread the word about this project ..

In these times, you should hold some major coins but you should always hold some really newborn promising coins.  When the market turns green, they have the tendency to fly even higher, I mean x100 high.  The reason behind this that new uptrends attract new people, they alway think: I missed the boat on btc and major altcoins, I'm going for a new promising coin with a low supply.  That's when Speedcash comes in the game.  With a supply of 476k coins, price of 72cents this coin (NOT a random erc-20 token) with a working product can actually explode.  Just look at this:

and you know enough...

https://coinmarketcap.com/currencies/speedcash/

Almost all of them have grown well. But they will certainly grow even more before the end of the year.

With regard to your post i believe it is a good point of discussion and with it we can reflect various aspects of the market and one of them we can prove to such a market downturn is the demand of investors for projects that have promised many perspectives, on some occasions causing frustrations. Now, in my opinion, the 2018 market is demanding and flexible and that projects that really add up tend to have highs this year, as well as: NEO, ETHEREUM CLASSIC, QTUM, DRAGONCHAIN.

I think that DRG, Litecoin, Etherium, Spectrecoin, Sether, TRON will go to the moon and soon, also reached a last maximum.