Few alt that i'm invested and holding for long term:

Decred (DCR)
Stratis (STRAT)
Nexus (NXS)
Nexium (NXC)
GameCredits (GAME)
NEM (XEM)
I/O (IOC)
BitBay (BAY)
Huntercoin (HUC) - Going to swap it to Chimera


I think those coins have huge potential and pretty confident about those for the future.
I prefer to hodl than trading those coins, most of the time i tried to trade, i ended up losing. So, i just hodl and buying more on the dip for those.

I'm watching few low marketcap coins also right now but havent decided which one im going to buy.