In my opinion since you don't know what to do I'd do the following.
1) Go on holiday and chill out sit and mull things over. It doesn't have to be over the top or anything
2) Forget all this reading books crap, whats the point they will in most cases be dated advice, better you go talk to someone and get some advice maybe from a few people not just one so called expert wealth manager.
I think for someone your age you should think about a) preserving your wealth b) building a portfolio of investments albeit a small one just to start off with (a % you'd be happy to lose in the very worst case scenario) c) you're a founder so possibly think about starting another company
But in all seriousness, take a holiday, I think you deserve it.
Lastly, well done man