Buy now, everything (altcoins) is cheap now, so this is a very good opportunity in where you can put your money. It is just matter of time until everything recovers again
in my opinion, it should be at this time if you have large capital to buy bitcoin to invest in the long run, because with a small risk of loss and it is clear for growth, everything is just waiting for time to recover but by investing in bitcoin will be bigger the benefits that will be obtained.