You can double your bitcoin with trading. trading is very profitable and also save enough for a experience trader. but it is not that easy as you are thinking. doubling bitcoin with trading needs lots of work and time. and of course trading knowledge and experience are indeed.
first one or two month you may get nothing and some time you may lose also, but don't loose hope and stay with trading and do what you are doing. one day you'll get all rewards of your time, handworks and investments.