I first try to figure why I would have writers block. Like, dude, am I bored with this scene or chapter? This story? Did it lose its luster? If so, yeah, quit that shit. Move on to something else. But if that ain't it, figure out first what is the blockage. If you don't know what is causing you to stall, how are you going to start fixing it? I keep hearing, "Wait it out, read a book, listen to some music, watch a video until you do a Rip Van Winkle and it'll blow over," and I HATE doing that.
Figure out what it is that plugged you up and then, only then, start working on a solution for it.