You're only about the 333rd person to ask about this. Search "accutrigger problem", "savage locked up trigger", "accutrigger=junk". You'll find plenty of reading.
The jist of it is the accutrigger is junk. But if you're just looking to get it working again, turn the trigger pull weight adjustment spring all the way in (max out trigger pull weight), and remove any and all grease where the sear contacts the trigger. It'll be reliable, but will feel like crap.
Long term fix is a better trigger. I recommend sss comp trigger
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