I've seen a lot of this and I hope I can help.
Some people keep going by trying to make even more money. I wouldn't really recommend this.
Some people just continue doing roughly what they did before, but as people here have noted, it's harder to tolerate nonsense of work life when it's optional. However people who lack any vocation do, I think, usually regret this. Its important to have some sense of identity, something to tell others and yourself, even if you change it from time to time.
Many people are talking about optimal investment methods, but I think this is not the core need. Obviously get professional independent advice on your wealth management and put most of it in a tax efficient ling term holding. But the real investment now is in yourself. Take some time to build a plan for how to connect, integrate and move on. Go on courses, read books, get therapy, make friends. Find out what you are and what you want to do with your days. You may have some hard lessons ahead, but welcome them, better do them sooner than later. With time things will make sense again. The energy will flow again like a river.
Good luck