47M, how to invest and live off €500k cash made from high-risk derivatives' trading over the last 10 years?

As the title suggests. 47M, living in Germany, currently earning around €40k net and saving around half of it. Tired of corporate life, no dependents, no debt. I was day trading for the past 10 years and made around €500k in cash. I now want to rev down and "retire" from this, pull the trigger and FIRE. How would you invest this amount of cash, so that you preserve the principal and live off interest, risk and stress free? Was thinking about moving to Cyprus. Rational decision? How's life and th