I think this way is so hard, because we cannot predict what will altcoin value will be. We do not have that power, where we can predict when will our bitcoin value will go high or low. We still need to be productive and not trust the bitcoin value, instead, we need to find a stable income.
If you have capital for investing then you try trading with few popular altcoins. Other than this bitcoin to fiat trading is profitable. These days without capital investment trying to earn 0.1 btc per week is simply hard, else you need to be the luckiest to win through gambling.