there is no secret way to make money.
other then the obvious of looking to fill a service that is new and demand I would look at old school stuff.
Those generally are the most resiliant and the biggest money makers.
Also most people dont want to do them therefore it makes them a money maker.
Like a car mechanic shop.
I have a buddy who owns a telecom wiring company, installs wiring for network systems.
It is a newer industry but very very competitive he has almost gone broke a few times.
He is buying a paving company..why? cause nobody wants to do it cause it is not clean and glamorous. but fuck does it make money.
