Back to 1998: I Became My Own Grandmaster

I Feel Like No Author Has Written a Story Where the Male Protagonist Quick-Transmigrates into Period Drama Worlds

I'm looking for quick transmigration novels with a male protagonist and a historical-era setting, where he transmigrates to different periods, such as the 1980s or 1970s, to save people or help the country. No CP! Basically, the protagonist transmigrates into historical-era novels. Please don't recommend unrelated stories, thank you!