Can we adjust the voltage rather than the wattage?
Yes, it is entirely possible to adjust the voltage (Volts) instead of the power (Watts) if your mod features a "Variable Voltage" mode. In this case, you directly set the electrical force sent by the battery. To stay within a classic and flavorful comfort zone, most vapers set their voltage between 3.2V and 4.2V. It is an old-school method that is very effective for stabilizing your experience, regardless of your coil's resistance value.
Technically, Voltage mode applies a constant electrical tension, whereas Wattage mode calculates power based on the resistance value. If you switch to an atomizer with a different resistance, the actual power output will automatically vary with your Volt setting. For your safety, always start at a low voltage, around 3.3V, then gradually increase it to avoid instantly burning your cotton. It is a rawer but very precise way to manage energy.