Loropetalum help

I have one of these in a container in my yard. It is not well. It nearly died once so i took it outnof pot and left it in a corner to die…it didnt, it started to grow new leaves so i re potted it and it got better but it still looks sad. How can i fix it? It has full sun part of day and some shade. I dont want it to die. Its one of my favs. Cumbria uk.