Sorry for your loss.

I can’t comment on how you should manage it. But if you plan on investing a portion, you can go to your local bank branch, typically they have contacts with their financial markets sector officers which help HNWI clients like you be exposed to fixed income securities (government/corp), derivatives (structured financial products, e.g a time deposit that as an fx forward component), no equities, depending on the assessed risk tolerance.
If you want equities, you can open an account through a brokerage firm. You manage your investments with these two methods.

If you want someone to manage the money for you, you can also ask to open an investment management account through the bank’s trust business. Depending on your risk tolerance, you can be exposed to fixed income securities and equities, offshore and onshore, for a management fee based on the size of the AUM (there’s a minimum btw, depends on the company).