If you are planning on living off this windfall as part of your current income and want it to last then you need to invest it in a low risk instrument with a steady return. I don't know if you are covered by US or German (or both) tax laws, so how to best shield the income from taxes will require the advice of someone who is an expert.

The rule of thumb is that you can withdraw 4% of the amount from a fund a year with a very low probability of it running out before you die. If you can find something that earns slightly more than this (say a long-term bond at 5%) then your capital will also have a small amount of cushion against inflation.

Anyone who gives you advice for money can only recommend something riskier and/or eat up part of your returns. You can, for example, buy US treasuries directly from the treasury for no fees and they will send you a check on a regular basis.

Advisers tend to charge a percentage of the amount under management as a fee even though the work involved has no relationship to the total capital involved. It's a scam.

Policies not Politics
---- Daily Landscape