Wouldn't that be simply just through govt T-bills which have almost no risk.
To be honest many things are fairly safe in the long run unless you get completely burned in the short run.
Nothing you can really do about that. I would just do T-bills
T-bills have the lowest risk, (unless government crashes). Trying to make $100,000 in one year from another $100,000 "risk-free" is just not going to happen. We can be 95% confident that you make a certain return and in general a 20% return on 100k is actually pretty good in monetary terms. Risk-free rate is generally 2-4% depending on a countries inflation rate so if you are beating that then you are doing great.