It is my experienced opinion that you should just let this map go. Fixing it would be like making a new map. If you start a new map, you can even just start by doing the mains and their naturals first, and then recieve advice from the forum and if it's good, and what to do next. That way you don't spend too much time making another map we'll shoot down, but you'll also spend more time on the main and natural, and perhaps start to realise it's importance.
You're still making straight lines. Symmetry can be achieved in other ways man, you don't have to make X's all over the map then trying to fill in squares to make terrian. Try again, but this time I really want you to make an effort to make the mains natural looking, like a rough circle. Also, you should put them in the corners of the map, because on this one they look really close. Don't even think about the rest of the map, just leave it blank. Focus on the mains. I really want you to put thought into the mains and how you think they should look.
Don't bother making a complete map no one will play. Take it one step at a time.