Conversation so far:
Where did Carleton reside post-war?
He arrived in Quebec on 23 October 1786.
What did he do in Quebec?
he was appointed "Governor-in-chief", with simultaneous appointments as governor of Quebec, New Brunswick, Nova Scotia, and St.
John's Island .
Did he do anything notable while Governor-in-chief?
His position as Governor-in-chief was mostly ignored.

Question: What did he do after that position?
Self-contained rewrite: What did Guy Carleton do after holding the position of Governor-in-chief?