Can't open up further the map in endgame.

I can't seem to find any more towers I can access to open the map further. It feels like it is limited to how many towers you can access. Is that an issue for anybody else? It seems to also be very hard to figure out your options if any in a big map.

https://www.shadazard.org/commonproblems#atlas

maybe this will help. Goodluck!