It's a bit of a recurring theme here that Britain cannot be defeated in WW1 by Germany, that Germany couldn't compel Britain to give up colonies or other things under virtually any circumstances including defeat.
What I want to know is with a PoD of 1 Jan 1913 purely for planning and organisational changes (no extra equipment over OTL to fight Britain or Allies with) what action can Germany take to defeat Britain in WW1. Further stipulations are WW1 must start as per OTL and any materiel changes can occur once the battle is joined.
No single panacea is required, stringing together a couple of things is pretty much a given in my mind.