Always make sure to use freshly-churned cold yogurt. It's best to use plain curd that is made from whole milk. Avoid using any flavoured variations for the best results.
To attain a creamy texture, use a wooden Madani mixer or wire whisker to churn the yogurt. Make sure to blend it for a longer time until it becomes frothy.
Adding ice cubes to the lassi while whisking helps make it thicker and creamier.
Adding too much water at once can make your lassi extremely thin. While adding water, make sure to add it gradually so that you're able to assess the amount of water needed.
To make your lassi even creamier, don't hesitate to add a spoonful of cream to it while whisking. This would ensure that the lassi is super thick, frothy and creamy.