I think it is good not to focus on one cryptocurrency, instead you can divide your investments into different coins and let them grow. If one fails, there's another one you can make money or give profits to you. Altcoins is another way to invest again in crypto market which I actually did these past few months. I gained lots of profits investing not only in bitcoin but in altcoins too especially in ETH, which is really good as an alternative to bitcoin. ETH has a potential growth in crypto market as being the best altcoin which has profitability and sustainability.