There are four basic ways you can vary your weight
Generally, the last Is not recommended as going off your normal swing but slowing the action as you release is the hardest to control and tends to result in short bowls.
Using your wrist will incrementally change your weight the most for the least effort but can make it harder to avoid turning your wrist and impacting your line.
For most bowlers, the top two give the most control.
Top Tip: For lengths close to minimum, consider if you need a minimal backswing if any at all, your follow through as you deliver may be sufficient to generate the weight needed