Trading  but it's risk depend on how you manage it.
I will advice  that you just buy  bitcoin  and hold for a very long while rather than wanting to seek other alternatives because it seems every option listed here for you already has their own risk and I don't think the risk are in anyway minimal.
One of the biggest mistakes people make is seeking always risk investment option and that's one great thing scammers capitalize on and I also want to advice that you should be careful  out there while seeking always risk investment option so as not to fall for scams.