I have a Librem 5. It's currently collecting dust in my closet. I was enticed by the idea of having a user-replaceable battery (my last phone upgrade was 100% motivated by battery life problems). However, the Librem 5's battery is basically as bad as my Google Pixel's was after degrading for several years. The evening I opened it, I set it down after tinkering with it for a little bit and came back the next day to it…
Could this be a software issue? Did you check if there are background processes draining your battery?
These kinds of problems are often not background processes, but instead parts of the hardware which haven't been powered off or power gated correctly; even a small leak of a few mA could be enough to drain a battery much more quickly than the user would expect.