To enhance the use of multiple guide curves in a sweep, you should:

Using a profile sketch that isn't so "rigid" allows for greater flexibility when applying multiple guide curves in a sweep operation. A flexible profile can adapt better to the shape and curvature of the guide curves, resulting in a more complex and intricate sweep feature. By not constraining the sketch too tightly, you allow for some degree of movement or adjustment, which can help the profile effectively interact with multiple guide curves, enhancing the overall design.

In contrast, options that suggest using only one guide curve or limiting the sketch to two dimensions would reduce the capabilities and versatility of the sweeping operation. These approaches could constrain the design process and potentially limit the variety of shapes that can be created. Making the profile sketch larger doesn’t inherently enhance the use of guide curves; it might even complicate matters depending on the context of the design. Therefore, having a profile that is more adaptable supports better integration with multiple guide curves during the sweep process.