20, f, 147lb 174cm gained weight on 3,000kl. would 2000kl/day be enough to maintain weight? i do high intensity workout 2x/ week 30 minutes each time

See dietician: I presume by KL you mean kcal or calorie? There's a wide variation in nutritional needs and so it may be constructive to get a dietician to see you and calculate out an estimated daily energy requirement. Here's a link to a rough estimator: https://www.eatforhealth.gov.au/eat-health-calculators Best however to see a professional for specific advice

Weight gain: Weight = calories in - calories burned. Use myfitnesspal app to track calories and exercises. It will all add up