WF is basically right in the sense that, 800K is decent size money. You will be considered successful, as that's made by you. So simply keep up with that.
Now it's not going to happen every now and then. You want to invest that money into something not what you are doing everyday. You mentioned, I have been thinking doing my own business. Now the serious question is: what can you do, what do you want to do, ...
JY's suggestion is actually one of those achievables, for you: you are an accountant, understands a lot of things. You could be passive investor, which meets your time requirement. (As matter of fact, I personally have some projects coming up, needs more capital and has margin. But I thought such topic will be banned here as it's public BBS.) You could sign a contract, have some attorney represent if you want...
Frankchise, many requires active operator. You essential buy a job: royalty, marketing expense, open up your book. Good for a lot of people. But after you've been there, done that, I bet you don't need it anymore.
Another way I heard some CPA or attorney do: they invest in good shape companies who are their clients.