If you would like to increase the memory usage, you could increase the batch size (or if possible and if it makes sense for your use case, the spatial size). Also you could use a bigger model.
However, note that not all models will and need to use the full memory of your GPU.
So as long as your model is training fine and you achieve the desired results, it should be alright.
I’m not sure, if I misunderstood the question, so please correct me if I’m wrong.