Simple: Remix and continue. Oh, and some rules: 1) This is not a game to win. It's simply something for fun. 2) Please limit your power. 3) Keep it somewhat tidy, not fully 100% perfect but it's a map, so it needs to be somewhat accurate. 4) Artificial islands (or islands you add) must be in grey and must not be bigger than the triangle islands you see already.
Credit goes to @Stetson12 for remixing.