Use another. And another.
My current project is to cut sections out of the soffits and add screening with a view toward increasing the airflow in the attic.
After marking off the position of the new hole (8x60") on the 3/8" plywood soffit, I limbered up the power saw.
Power saw was too heavy to hold upright and very difficult to maneuver correctly.
Okay, try the HF Multifunction tool. After cutting a bit, I computed it would take several hours per hole.
Damn! Break out the itty-bitty B&D battery-operated mini-saw. Been so long since I used it the batteries were junk.
Angle grinder with diamond blade - more smoke than cutting.
By now, I have about three hours invested in one stinkin' hole! Time to take extreme steps.
I limbered up my electric chain-saw pole trimmer.
Damn thing went through the project like a silver bullet in werewolf's butt. In two minutes I had the hole I wanted and a LOT of sawdust I didn't especially want but didn't mind.
I've got four or five more holes to make, but it won't be much of a job now that I've found the right tool.
------- Aside:
Here's an ad for a shooting range in Kentucky. No, it's not photoshopped. It appeared on the back page of a free weekly newspaper.