I'm considering an extreme diet to lose the 3kg I gained rapidly after returning from a trip to China. How many days would be appropriate?

I ate like crazy after my trip to China, and I was so shocked when I looked at the scale ㅠㅠ I've gained 3kg...

It seems like my weight is a mix of bloating from my trip and sudden weight gain, so I'm thinking of trying an intense, short-term, super-fasting diet for a few days!

For those of you who have tried extreme dieting to lose weight quickly after a trip, how long do you usually do it? I'm curious how many days I should maintain such extreme dieting to lose about 3kg most effectively and without putting too much strain on my body!

Those of you with experience, please give me some great tips or realistic advice!!!