Although the map is very nice and supports fast combat, you need to understand what a defuse map is. Your map should contain two bombsites A and B with the CT's spawning closer to the sites than the T's you have a very nice A bombsite which you can still use. I would expand out a floor plan and then build around your current map making another bombsite and a mid and choakpoints for the bombsites as at the moment it is one big box I have many links of tutorials you can follow if you wish to do this but I believe you can turn this map into somthing nice with a full map, I suggest to build the rest of the map into dev textures first though.