outside of swapping it for a new one, idk personally except ruling out other possibilities. its easy to change out tho and a common failure point.... I hate to throw parts at an issue myself but sometimes its all you can do unless you have some help. a strong fully charged battery is essential .
if you've had intermittent no start issues in the past then that's also very strong indicator that the ignition key cyl is at fault.
This six generation monte Carlo's do not have a chip key I have a 2001 SS model it's a regular key. There could be a problem with The ignition switch I had a similar problem that turned out to be the ignition switch then it was the alternator that's why the battery light was coming on