We have often witnessed that the growth of altcoin is associated with the growth of bitcoin as whenever there is a pump in the value of bitcoin we have witnessed green days for altcoins too but how long will altcoins be dependent on bitcoin? Do you think altcoin can do it alone and have it's own pump and dump without being dependent on bitcoin? What will it take for altcoin to prosper without bitcoin's involvement?
Try to look at on top altcoins which can be trade off directly with fiat.As you can see which not all the times alts prices do correlate nor follow bitcoins price direction.
It may go either along the way or would go to the opposite side.It depends on the market situation but we cant really avoid the fact that alts is mainly depending on bitcoins price wayback.
Where you do end up on exchange your alts to btc first before you can able to earn or gain fiat.