https://www.digitaltrends.com/cool-tech/ligo-upgrades-gravitational-waves/
After detecting gravitational waves, which is a great technical feat in itself, Gravity wave astronomers are looking to go further with 40% increased sensitivity and a whole year(as opposed to just kind of turning it on, and almost accidentely detecting a black hole merger).
I'm not sure if they are sensitive enough to detect a black hole, or neutron star collision or two every week or so; but, certainly, being able to be online for a whole year will give a much larger sample of black hole mergers, formations, neutron stars and maybe who knows what else(dark matter? probably not quite yet).
The gravitational wave astronomy still has a decade or two and putting a gravitational wave detector in space to detect primordial gravitational waves - gravity waves from the Big Bang explosion itself. So, the most exciting discoveries are still a bit in the future. By then, the James Webb and even the Extremely Large Telescope will have been made and operational.
