You can improve your safety while diving with nitrox by:

Using the same depth and time limitations as an air table or air computer is a sound practice for improving safety while diving with nitrox. Nitrox has a higher oxygen concentration than air, which can lead to an increased risk of oxygen toxicity if appropriate depth limits are not adhered to. By following the depth and time limits that are appropriate for air, divers can mitigate this risk. This approach helps ensure that divers remain within safe operating ranges and do not inadvertently expose themselves to higher partial pressures of oxygen.

The other options could lead to less safe diving practices. For example, adopting a more aggressive dive profile or increasing bottom time without considering the specific limitations of the nitrox mix could increase the risk of experiencing nitrogen narcosis or oxygen toxicity. Diving only during daylight does not directly affect the safety of the gas mix being used — it is more about the environmental conditions rather than adhering to safe dive practices.