What can I do?

I made and AoS, and now I want to change its tileset. I used WEU to create that map so I can change the tileset easily but the problem is I want to make completely new terrain, wha should i do?
1:You should try to delete all doodads and terrain in the map and start all over again.

2:You should create a new map wit hthe tliset you want and copy and paste all the triggers and custom things.

3:You should just Re-Tile the map.(Use same terrain but another tileset.

You can use the change tileset thing ni the advanced options, and theres a replace doodads, thing too that you can replace all the trees and shit. ive made a map on lorderon summer and decided i wanted it barrens before, and it works good for me.