https://www.profstonge.com/p/is-this-the-fourth-turning
The broader concept that civilizations run in cycles is very old. In 146 BC, Polybius laid out the rough contours of the political cycle -- the"kyklos."
Polybius' formula is actually better known than Strauss-Howe — you've seen it as the "Hard Times Create Strong Men" meme.