>I think you are ignoring the fact that citizen science was alive and very well up into the 1980s.
Some version of that still exists among people with a naturalist bent recording observations of reptiles, birds, plants, etc. But yeah, we don't really have backyard chemists analyzing things anymore.
Astronomy also has an important citizen-science component, and many discoveries are made by amateur astronomers each year.
Another interesting aspect of citizen science is replication of existing scientific research,
Often with experimental modifications that make the experiment much more approachable for amateurs. Sometimes this even leads to process improvements that facilitate industrial application.
Some version of that still exists among people with a naturalist bent recording observations of reptiles, birds, plants, etc. But yeah, we don't really have backyard chemists analyzing things anymore.