Try to use two upgraded mage towers with armor reduction + two upgraded archer towers to ranger to start with, on last row; use one barracks middle on last row also, and two on the row before, up, to keep enemies in range of towers. As you upgrade, don’t go full on barracks, but keep gold and add mage towers and maybe another archer if you want, going for armor reduction on mage towers and that vine enemy-stunning upgrade on rangers. Other that that, it’s just a reinforcement and meteor thing. At least, that’s how I got it done. Good luck!