Update of my 6 months old clover lawn

During the current severe drought, my clover (with additional hard fescue) has become patchy and weak, with yellowing and curling leaves. I plan to add compost and water it weekly, as I don’t have time to do it more often. Do you think I should also consider fertilizing it with a low-nitrogen fertilizer during summer? My soil is sandy and very poor in nutrients. Zone:6B