Don't let bike shops and other forums tell you that you bought into a dead bike, that's nonsense.
I have a bunch of bikes, my oldest is a 1977 Raleigh Competition GS, and I can find any part I would ever need for it on the internet, and so far, any part I've bought has been brand new except for the brakes, (actually those I did find new but didn't want to pay the price), and that bike is 47 years old! I just had to replace the 5 speed rear gears with a 6 speed, and got what's known as a corncob gear set, brand new, and in the box made by Suntour Winner Pro that works great with the all-Campy setup, in fact it now shifts better than the old Campy freewheel. A few years ago, I replaced the Campy GS derailleurs with 1976 to 1978 Campy Nuovo Record, got those brand new as well, and they were cheaper than buying 2024 Ultegra derailleurs!
There are a lot of internet stores that sell the older stuff, as well as on
Ebay, there's even a place where I live that had a set of like new Campy brakes from the 1977 era, I put those on to replace the Weinmann Carrera brakes that didn't work real smoothly. I have bikes from the 80s, 90s and 2000s, never an issue to find parts for those either.