“We are both delighted and heartbroken that Grace and Frankie will be back for its seventh, though final, season. We’re so grateful that our show has been able to deal with issues that have really connected to our grand generation. And their kids, and amazingly, their kids as well,” the pair said.
“We’ll miss these two old gals, Grace and Frankie, as much as many of their fans will, but we’ll still be around. We’ve outlasted so many things – just hope we don’t outlast the planet.”
While neither gave further insight into the reasoning for the show’s cancellation, it’s been speculated that the show declined in ratings once Netflix began putting out original content on a nearly-daily basis.
Source : https://www.distractify.com/p/why-is-grace-and-frankie-ending