If your plants survived the heat wave count yourself fortunate. Maybe give them a little extra water and
compost tea.
For me I think having several different gardens or garden areas with different conditions may help. For instance one area would be more flood resistant with raised beds or hugelkultur, another more drought resistant with basin beds or buried wood beds. All garden areas should be protected from wind, but still allow slight breezes to promote healthy ventilation, avoiding fungal infections. Obviously having a variety of growing conditions is going to be harder with a smaller space.