Please pick my next hardest map

If you're aiming for Hardy AA, I'd recommend avoiding wave-focused maps like Soweth and instead try maps that are difficult overall, like Erebus or Kuju. However, Erebus is a really terrible map in terms of gameplay and difficulty, so Kuju seems like a better choice. Of course, if you enjoy Soweth-style maps or plan to sell Soweth later, I'd also recommend trying Generic, as the map itself is fun.