Olive Tree Advise

We’ve had our sweet olive tree for four years. The last two years we moved, and moved it to a very hot sunny south facing corner of the house. It’s also up against a white wall that reflects a lot of sunlight. Sadly it’s been looking very sad and scorched. We thought it was just winter and the cold temperatures and windy days. Wha can we do to bring it back to life? Should we cut off all the dead branches and leaves, do we give it vitamins -any advise would be so appreciated. Thank you!