Less PPVs is obviously a no-go. Doing less house shows (at least for certain period of time) could work but even then, you're still wrestling most days of the week and/or most days out of the year. They're not gonna slow down in any real capacity.
Maybe stop doing so many hardcore matches or useless bumps through tables or whatever that don't always need to be done (well, never mind, there's an entire PPV dedicated to hardcore matches coming up.) I remember after Punk came back from his surgery that caused him to miss the TLC PPV, he was thrown right into a TLC match on Raw where he could just as easily been injured again. I was quite annoyed by the decision at the time.