I think the standard way is to diversify. 40% in Bitcoin and Ethereum, 40% in Top 20 coins. and the remaining 20% in higher risk coins. The actual price of the coin is largely irrelevant, it all depends on supply and room for growth. Bitcoin is unlikely to ever see multi 1000% returns, at least in the next few years, but there are plenty of altcoins out there which have the potential to do so. What Bitcoin does provide is a level of confidence, even after the recent drop. It is an essential part of anyone's portfolio to give stability.