Dear Mr. Singh,
Since it is clear that all your dues were settled and also your ex-employer cannot initiate any action against you, I suggest as a goodwill gesture, please guide them to transition smoothly in your absence. Additionally, remember that the past experience gained has helped you in securing better opportunities. Therefore, there is no harm in offering assistance even after you have left. You can continue to maintain good relations with your bosses and colleagues even after leaving the company.
God forbid, what if you have to return to the same employer in a few months...
Cheers,