It's a little difficult to estimate 30 kg, but it may make you thinner. In fact, you can try dieting to lose weight, calculate how many calories you eat every day and stick to it every day.

We need 1200kcal every day to maintain our metabolism, plus 600 calories consumed in general activities every day, so we can lose weight and burn fat if we consume less than 1800 calories every day. Plus "a cup of black coffee every day, walking for an hour four times a week and riding for 40 minutes", it should be no problem to lose 20 pounds in half a month. I hope you can throw it away as soon as possible.