The Mythic Age

Before I say anything, a credit to ES for making this age a lot more active in the x pack. It’s a great age! If you see you are taking the map back, go with Atlas. You can overwhelm your enemy with excellent Argus and his mighty Implode. Unless you are desperate for a titan, upgrade all your men to champion and make sure you have at least the second line of armoury upgrades.
Now the different side of the story is if you are stuck inside your base with only 2 of the 6 settlements on the map. Two words. Hekate. Titan.
Put up plenty of fortresses in your base and leave a distinct space for your titan gate to be built. Wall off any major entrances to your base, and get the medium wall upgrade. Keep you econ booming right until that Titan gate GP appears. Place it in that defended spot in your base and call all your villies to it. GET MYTHIC REJUVENTAION. See why you need that favour now? (30 for the Hekate tech, 50 for secrets of the titans). Put your 2nd Hesperides next to the gate.
Bring your army back to defend your Titan gate – obviously.
Make sure you use the shift waypoints to task your citizens back to work after they have built the gate - Your Titan will need some aid if your opponent is also in Mythic. In team games, you titan will give you an advantage on the battlefield, but if it’s a 3v3 or more, the battle WILL GO ON. In a 1v1, once your titan is released GO FORTH AND CRUSH YOUR ENEMY! AND CLAIM THAT LAND AS LAND OF gaia gold!