Nick Drake and others like him

Wrong again. According to Wikipedia he O'D on heroin.

Jeez, I'm an ass. Jeff did drown, the old man (Tim) O'd.

It was Heroin for dad and Wine related drowning in the Mississippi for the son.Both activities may be judged somewhat suicidal.

Listen to Neil Halstead, sometimes fools me as the reincarnation of Drake!

Some others from back in the day: Incredible String Band, Sandy Denny, agree with the older Tim Buckley, Shawn Phillips, The Gentle Soul, Chuck & Mary Perrin, Ron Elliot, Robin Williamson, Steeleye Span, Fairport Convention, Pentangle, Nic Jones, Shirley Collins, Amazing Blondel, Magna Carta, I could go on and on.

Agree with the last post, especially Nic Jones.
The newer artists mentioned, while good in their own right, are nothing like that era you ask about. Look for anything on the Hannibal/Carthage label.