It's too early to talk about liquidity at all ... even those altcoins that have been trading for a long time and on large exchanges do not have normal liquidity.
They do not have any liquidity because they do not have any practical use. Nobody needs them besides speculators.
Okay, tell me then, which cryptocurrency has a practical use today?
Ethereum - Many cryptocurrency startups use Ethereum to issue tokens to conduct IEO or ICO to attract money for development.