I belive that the Bitcoin turns just like a currency, just like us dollar or euro. After the big market fall in early 2018 the bitcoinprice got stabilised. The price has stayed between $6000-7000 and it seems like it will go on like the same. So i think there would not be big falls or rises again. To invest altcoins seems understandable then bitcoin, if you have large ammount money you can buy bitcoin and hodl, otherwise altcoins market is better for earning today