Re the 90s
I looked at
Secret Origins the Story of DC Comics
Around
1 hour and 17 minutes in
And my super hero genre history
From after crisis in 1986 to Kingdom Come in 1996
There were two distinct trends in that time
The bright and shining reboots of Superman by John Byrne and Wonder Woman by George Perez. Plus The lighter touch of Justice League International
The much darker but well written worlds of Frank Miller and the British writers that eventually resulted in Vertigo.
By the time the 90s came around the second type of comics were selling
The more traditional heroes were not selling
So DC did stunts
to jack up sales
Aquaman lost a hand
Hal Jordan became Parallax
Traditional DC Comic books lost their way especially as they tried to compete against
Image and Vertigo.
Kingdom Come in 1996 was a rebuke to all this
Again see
Secret Origins
at one hour and 17 minutes
for a summary of that time.