FSCK is a tool for checking the consistency of the file system. If it is running every time you try to start up and not getting into Piper, then the SD card may have become corrupted.
You could try installing the latest version of the Piper image:
FULL (7.40GB) image found here.
COMPRESSED (3.37GB) image found here
on an SD card and see if that works, if it doesn’t you might just want to buy a new SD card. I use Samsung EVO cards.