to me the best option is to invest your money in bitcon, and there you can get double services, one is that your money will be too safe in bitcoin and the second is that you can really make a good profit just for holding your bitcoin, therefore the best option is to invest your money in bitcoin.
Investing in bitcoin is not safe and involves huge risk as we don't know where bitcoin will land in future and what price it would be holding so you should invest only that you can afford to loose.
I think it's quite safe if we just hold bitcoin. even for the current and the next few years could be safer, because bitcoin will continue to grow and at least there will be a price increase in the future. It might be more safe when you buy at a price that is low enough.