re: Need a new book series to read

Pendergast books by Douglas Preston & Lincoln Child
Bob Lee Swagger by Stephan Hunter
Jack Reacher by Lee Child


Your taste in books is damn near identical to mine, and while Mitch Rapp used to be my favorite book series, it's now the Pendergast novels by Preston & Child. Read through them all multiple times. I will say it's probably the least like Rapp/Sigma of the ones I suggested (it's more crime than covert ops, but they are definitely not traditional crime thrillers - Pendergast is FBI, but also ex-special ops and does basically whatever he wants like Rapp). Read the Pendergast books in order. He starts out as an almost side character in Relic, but him and his past quickly becomes the focus of the series.

Swagger is another fantastic character, though I haven't read all the most recent books. Same with Reacher.