You are so risk averse you better off with CDs or Bonds LOL. To obtain what you wish, you need a fantastic edge, if you had it, I seriously doubt you would be asking these questions.
Institutional investors pay 2 and 20 to seasoned, informed hedgefunds to *try* to get that kind of performance.
Lots of guys can do that for you.You need to do research.Some of them can do 5-10%(half risk) per annum with the low 5-7% monthly DD,fully atomated.
100K euro doubled in 10 years and you consider this sufficient to retire? I am not sure which part is more implausible.