Bitcoin is not stable because it is part of a trading platform. Trading will usually have volatility. Moreover, this volatility is the main reason why people are so interested in Bitcoin. Because everyone wants to change their life from bitcoin but if bitcoin goes to a stable stage is it possible? Moreover, Bitcoin was not designed to be stable. You might expect such stability for altcoins but it is never possible you can exploit this volatility to reach your destination. Altcoins will start to be bullish when Bitcoin is in bullish sentiment in the market. Moreover, inflation is currently on the rise everywhere. By investing in Bitcoin an investor can retain the exact value of his money which may be difficult to retain through anything else.