Sitstart on the left with a good hold and an undercling. Get up the high heel to sit on so the slopers on the arete get more comfortable. Travers a bit to the right after, so you can top out on the right side of the face
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.