Hi
The only other thing I can suggest is to have a second editor on the screen and try this:
First make a copy of the file to work on.
Now open a new trigger file and copy and paste each trigger individually to the new file.
Maybe also try copying 2 or 3 triggers from the original to a new file, and try and delete the copied ones from the original to free some space.
Failing that, you might need to email the trigger file to support and ask if they can try to recover it.