You do know there are other ways to invest.. Not just bitcoin or gold, I'd suggest talking to a finical adviser about your investment options.
If you are content with low returns then it is probably best to save your money in a low interest account. It will be insured and is 'safe'.
Gold is a solid investment, the price is quite low at the moment, it seems like a safe long term investment, not very fungible though.
Bitcoin is dangerous, you could lose most of your money quickly, you could also make lots of money. It is fungible, if you can handle the stress of big price swings, it is a good investment in my opinion.
I wouldn't put all my eggs in one basket. I personally am long oil at the moment, I can ride out the overproduction dip, but it won't stay at $50-60 for long, I am willing to bet on that!
i will say it is better to save money than investing it because when you save money you have some backup for later when you decide to stop with work you always have a back up or at least some extra cash for unexpected things that come your way.