You will require to go both left and right to expand your area and catch the cover points, it's crucial for you to focus on a single lane. Attempting to damage both defense towers at the exact same time is very hard and dangerous to attain, even versus average challengers. Rather, concentrate on a single lane in order to take among the 2 defenses out: in some cases, that's all you require to do in order to attain success. Damaging both towers AND the base is practically difficult. A clever challenger will attempt to counter on the lane that you're not assaulting on, so attempt to have some defenses in place as typically as possible: from fast options like grenades, to low-cost cards that will keep your enemies locked for your towers to take them out.