1993 Jaguar XJS - Low Reserve / electrical issue - battery cables were crossed

Car was purchased from California 7 years ago and has been garaged stored since. Front brake calipers and shocks were replaced when purchased. I put very little miles on the car. just to run it and roll the tires. The car was never titled by me but I have the signed title from the previous owner. I recently replaced the battery and accidently crossed the cables. The car won't turn over currently but ran fine up to that point. There's no rust on the car. interior shows some wear. Headliner was removed to due to sagging fabric. I never restored but have the substrate available for the next owner. These cars have beautiful lines and really turn heads. I hate to part with it but I don't have the knowledge or time to dedicate to it as intended when purchased.