Hey prelifecrisis, I’m from Germany too and I have some friends who experienced windfalls in the 2-10 million range (some of them in crypto, some of them selling their businesses). I can connect you to them so you have trusted people to talk to in Germany that have lived through exactly the same stuff. I think talking to others who experienced this who can relate is really important (with friends and family it’s usually not necessarily useful advice). I see a ton of not-that-useful advice in this thread already.

> I have no idea what to do with the money.

Set aside €50k that you spent freely on whatever you want for half a year (for traveling, small things you always wanted to have). Put it in another bank account and live with it for half a year and have fun. Maybe take a break semester (Urlaubssemester), especially if you feel low right now.

Don’t do anything with the remaining money for the next 6-9 months - just hold fiat (I’d suggest holding CHF instead of Euro/USD), don't worry about inflation - it's about you now. Don’t spend it on luxury items to fill any holes you might feel inside right now. Then after that time you can still invest in conservative assets and real estate, but now it's about you and your well-being. - I really don't like the comments here talking about the money and what to do with it, please don't listen to it. It's secondary to your situation.

> And I also have no idea what to do with my life now.

> I start to feel fatigued

The fatigue is most likely happening because your mind is enumerating all the life options - it's working very hard right now and that's why you're feeling down. Before the windfall, it was all focused on building a startup and getting successful which is a very clear goal. Now that you've attained wealth, you’ve lost the clear goal you’ve had before.

Now that you have enough money, you are left alone with the question that most success-oriented people would rather avoid: Who am I? What’s my motivation for doing things? What do I really want? I really like the waitbutwhy articles to help with that [1].

Let me know if you want to connect, these friends of mine are really great and have battled with the exact same questions. It's not easy to find people who can relate to this situation, most non-millionaires can't imagine the tension the money brings to relationships with friends and family and stuff like that. Trust issues etc.

[1]: https://waitbutwhy.com/2018/04/picking-career.html