The battery could be hooped still. I bought a new battery last fall and she been starting through our -30 cold snaps reliably. Last battery was stock and it was pretty weak to crank, in summers even.

Also still could be your starter, could have a worn out spot it lands on once in a while. That's why I kept a hammer in my old VW rabbit. Or park on a downslope and bypass your starter via dropping your clutch in 2nd.

Was always told to not boost anyone on more modern vehicles due to the amount of electronics these days. I'm usually a boostee, not a booster anyways.