Keeping it as Bitcoin is one good option. Another option is to buy some good choices of altcoins. At least your portfolio is diversified a bit. If the price of Bitcoin is falling down, you have another chance of growth in your altcoins. And if your altcoins are suffering, at least Bitcoin might be going the opposite direction. If you want to add some altcoins choose the top ones such as Ethereum, POWR, Waves, Monero, ADA, and LTC.