The rule I have seen, and have followed is to target 1-2 lbs (about 0.5-1kg) per week. Any more than this and you start having issues where your skin doesn’t shrink at that same rate, or your body having issues baselining to the new weight[0]

Personally, while tough to keep that as an average weight, I was successful doing this, primarily by going to one meal a day, and limiting calories (especially carbohydrates). Only issue is your body does end up burning fat, which makes your feel a bit more “oily”.

[0] https://www.healthline.com/nutrition/losing-weight-too-fast