After rendezvousing with La'an, Spock and his crew learn that a group of Klingons are planning a false flag operation in an attempt to restart the Federation/Klingon War.

Source: https://screenrant.com/star-trek-strange-new-worlds-chapel-mbenga-drug/

In order to cross the time barrier, Kirk and the Klingons must work together.

Source: https://gamerant.com/star-trek-best-klingon-stories/

L'Rell and Voq/Ash Tyler emerged as the most important Klingons in Star Trek since Worf (Michael Dorn), Gowron (Robert O'Reilly), and General Martok (J.G. Hertzler).

Source: https://screenrant.com/star-trek-discovery-every-good-thing/

Presumably La'an has other, hitherto unrevealed powers beyond the ability to outdrink Klingons.

Source: https://screenrant.com/khan-every-augment-super-power-in-star-trek/

Roddenberry did not want to use the villains from "The Original Series" — his "TNG" production bible says Klingons and Romulans are verboten.

Source: https://www.slashfilm.com/1364741/gene-roddenberry-star-trek-no-interest-worf/