This is just basing on my altcoin holdings in my wallet :

Eth
Wave
Doge
Kick
Stratis
Monero
Eos
Qtum
Omg
Ripple

I earned some of them from bounty campaigns. I can see a potential in these coins. Im trying to hold them for as long as I can. Because some of them could pump anytime soon and that could be the perfect time to earn profitable amount.