Did he ever try to start from scratch again? As far as I know he successfully wrote under several pen names.

Also, he is not out there selling courses or writing Medium articles telling others how to be a successful writer online.

And if he ever gave advice, it was platitudes like this: https://medium.com/the-mission/these-writing-hacks-from-stephen-king-will-immediately-improve-your-success-c8456b192cd4