If you like the Call the Midwife memoirs by Jennifer Worth.....then check out The Nightingales series by Donna Douglas.
If you like true crime sans murder....then check out Conspiracy of Fools by Kurt Eichenwald.
If you like WWII era historical romances....check out Sarah Sundin's trilogies.
If you like adventure/road trips with your romance...then check out the Tang Dynasty series by Jeannie Lin.
If you like more recent historical romances...then check out Let It Shine by Alyssa Cole or any book in the Decades: A Journey of African-American Romance series (each book in the series is written by a different author and takes place between 1910-2008ish). Decades have some of the best romance covers ever!
If you like Regency era historical romances but need more color *cough*….then check out Vanessa Riley's Advertisements in Love series.
If you like historical romances other than Regency era or another mail order bride...then check out Piper Huguley's Home to Milford College series (Reconstruction era/early Gilded Age) or Migrations of the Heart series (WWI/post war/early Jazz Age).