The revolutionary stuff that people could invent by themselves, on their own resources, was low-hanging fruit that has already been picked. The stuff above it requires teams of people working in laboratories/workshops that can’t be attributed to a single inventor. The physics and technology required to truly make something nobody else made before is just no longer trivial.
People are still investing things, but they are in very niche settings and very niche inventions that you need to know the field to understand. You don’t hear about them becaue they rarely have people making social media buzz about their work. Steve Wozniak is attributed several inventions but most people hear about Steve Jobs or Bill Gates.
The other thing to keep in mind is marketing/propaganda. The myth of the genius inventor that creates one revolutionary new invention after another is exactly that: a myth created to flatter their own egos and shine their own business (as well as sell newspapers). Edison is notorious for this but he was not at all the only one before and since.
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