How to release memory while importing the big asset using c++?

I create more than fifty VolumeTexture to make animation into Sequence,so i write for loop to create NewObject and Using Package::SavePackagewrite to the disk and my 64GB memory run out.Error show that system has no free Memory to use,but when i saved my texture to disk i delete everything related to this volume texture,but the memory still runing out.What should i do to release the uasset link in memory?

Are you doing a Package->Unload() as well as destroying your textures?

Also, the garbage collection may not have had time to delete the memory: