"To continue the saga" means to carry on or extend a story, usually one that has already been established or started. It implies that the narrative will progress, develop, or unfold further. Full definition
Continuing my saga of perfectly comfortable summer outfits that all look pretty much the same, we have a monochromatic display over today's look. (thefashionmedley.com)
The Matrix Online is an online multiplayer game in which thousands of players can assume active roles in continuing the saga of The Matrix movie trilogy. (gamespot.com)
As far as continuing sagas go, this abysmal sequel is on a par with such recent disasters as 2013's A Good Day to Die Hard, 2014's 300: Rise of an Empire, and 2016's Republican presidential primaries. (clclt.com)