Hello! Before pregnancy I was 49kg, I went into labor at 63kg, after …

Hello! Before pregnancy I was 49kg, I went into labor at 63kg, after discharge I weighed 57kg, a week after giving birth I was already 54kg. And now for a month the weight has been stubbornly at this point. To cut down on my diet is not an option, as we're breastfeeding and physical exertion is only allowed after 2-3 weeks. And even then I don't know how intense they can be. I want to be beautiful by summer and get back to my pre-pregnancy weight? How did you experience this? How quickly did you return to your pre-pregnancy weight? What did you do to achieve this?