For those who have lost weight for a month, what was your diet like?

I'm planning to start a proper diet this time. I am currently 165cm tall and weigh about 58kg.
My goal is to lose about 4kg a month and reach 54kg, but I'm wondering if that's too unrealistic.
I usually eat 2-3 meals a day and tend to snack frequently, so I'm planning to start by cutting down on late-night snacks and sugary drinks, and try doing about 40 minutes of cardio 4 times a week.
For those of you who started a diet at a similar weight, how many kilograms did you lose in a month?
If you could tell me about your diet and exercise routine, I’d like to use it as a reference and try it myself!