Failed to route the following signal

Are you sure the 24 horus is synthesis? It seems like the fitter is taking a long time(which is expected for something that is hard to route).

First pass shows:

Info: Average interconnect usage is 89% of the available device resources

Info: Peak interconnect usage is 152%

Third and final pass shows:

Info: Average interconnect usage is 68% of the available device resources

Info: Peak interconnect usage is 96% of the available device resources in the region that extends from location X23_Y0 to location X33_Y11

What is the design doing? It has 99,000 LUTs and only 164 registers? It's the "everything talks to everything" topology that makes this design significanly more routing intensive then most designs. Sorry, but I don't think this is going to route as-is, and really don't know what could be done to make it better.