Your decision to choose to invest all your money in Bitcoin can be useful in the future, or you will spend Christmas with a little money, I salute your courage to take risks but maybe you have considered it, but I dare not risk all money by buying bitcoin, now maybe a good time to buy some bitcoin.
You do not need to buy expensive gift but simple things can make people happy though. It is not good time to sell your coins to afford the gifts but be practical. You can give a gift even if it is Christmas. Buy bitcoin and set aside the old investment and make it profitable.