I recently (a year ago) set up my Linn TT (with new cartridge) after 30 years of being in storage and have found my old original LP’s seem to sound better than the new ones. My old records have been properly stored and cared for so are pretty much in mint condition - many recently played for the first time. My point - your records may be damaged. My experience has been some of the old ones still sound absolutely incredible.
Old records.
I’ve been literally keeping my somewhat recently bought turntable (and accessories) on the shelf and not using it after spending a lot on it (for me.) ( You can take a look on my profile)
After comparing it to my digital side for quite a while I decided the SQ was not nearly as good. So, I put the cover on it and let it lay dormant.
Now I have a collection of about 3000 LPs, mostly from the 70’s and 80’s. And, sad to say, most of them just don’t sound that good. However I’ve recently been playing some newer records, and the sound is wonderful. I know this not supposed to be the case. So, it’s possible all my old records have been somewhat damaged with old or faulty styli. Anyhow I now have a new lease on life with my analog side.