This is not a get rich quick scheme. While returns can be good at times, I have seen periods of stagnation, five +30% market dips and a bear market. Whenever you enter the market, it could be on the rise, in a drop or be stagnating. I have also had days and weeks where I have seen a significant decline in my portfolio. I can't predict what the market will do when you enter. Please invest for the long term. This is much more volatile and risky than the stock market.
Always pay attention to Bitcoin. Most altcoins (every cryptocurrency except Bitcoin) are pegged more closely to Bitcoin than Asian currencies were to the USD during the Asian Financial Crisis. If Bitcoin price pump drastically, altcoins price can go down as people try to exit altcoins to ride the BTC profits; inversely, if Bitcoin prices dump drastically, altcoin prices can go down, too, as people exit altcoins to exchange back into fiat. The best times for altcoin growth appear when Bitcoin shows organic growth or decline, or remains stagnant in price.