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Heyy! You’re cat is really pretty, anyways you need to accurately track your calories to be in a deficit, but to do so you will really need to know your true maintainence calories which you will know after track your weight straight for a week, and counting the calories. Remember if your weight does not increase or decrease significantly then that’s your maintenance calories, now according to your needs and weight goals reduce the extra calories from carbs. Eg if your maintenance calorie is about 2700 then to achieve 0.5kg weight loss per week you need to eat about 2200 calories per day, just an example use a calculator my math not good

You may be over-exercising. You muscles and body need time to heal. 6 days a week is a burn out schedule depending on what you are doing. Walking 6 days a week is fine but weight-lifting or running 6 days a week will lead to burn out or injury. My SIL is a personal trainer and she doesn't train 6 days a week. My daughter was a competitive dancer. She trained four days a week for dance then one day with a personal trainer. Two days were recovery days. You probably have a huge build up of lactic acid in your muscles which is leading to soreness and water retention.