No one here can pinpoint altcoins that will give huge return in shortest possible time. But,  I would advise any investor to take out time do proper research on the coins to buy. Read through white paper and decide for yourself. But from my research so far, Zil, qkc, steem, mft, litecoin cash, digibyte, eos ark are all great token. You can research further. Lastly, take only well calculated risk guys!