My main reason for investing in bitcoin is the high liquidity of Bitcoin and thus the ease with which I can trade it if I need money for something whilst holding it.
Another reason is the fact that it is very popular and also can sometimes be accepted by some merchants as payment for goods.
Bitcoin is stable and the risk of investing in Bitcoin is much lower than with other altcoins in the cryptocurrency market. I hope Bitcoin will reach new targets this year and bring the cryptocurrency market further. This is a good time to invest in this market.