Me, personally, getting past that critical point, embracing the suck. That's kinda the point. I hit that miserable point. I keep moving forward however I can. Whatever stupid bullshit comes up, you (I) just get through it. Somehow. it doesn't matter how. And then there's a bit of a release. Maybe just glide through the last few miles. Maybe rub some dirt on it and walk home. It doesn't really matter because I complete the loop. I sort of shed the vision of what it might be, and learn what it really is. And that's super helpful.
Mark Twain wrote life on the Mississippi, and wrote a lot about how cool it would be to be a riverboat pilot. The beautiful pink sky, the ripples on the water. And there's sort of a heartbreaking transition when he learns the pink sky means a storm is coming. the ripples mean there's a sandbar. In his unknowing dream, everything he loved about it was a disaster waiting to strike. He learned in his own way.
For me, there's a joy and romance to running a marathon that was completely unlike what I thought it was before I started.
So anyway, maybe the subtle shift from goal to quest is enough to help some people embrace the suck. Nothing is what you think it is without doing it. there are parts that are awful. if you can get through it, you'll get nothing you hoped for. but maybe the change of perspective is enough.