As long as that $300 isn't going to cause you or your family any hardship, just keep it invested long term. In a year or two it may double or triple. Nobody knows what will happen for sure, but $300 isn't usually life and death and there is a potential for BTC to get huge at some point.

Long term BTC is basically going to go to $1000 or more, or to $0. For $300 I would just wait and see.