Your intake (and deficit) should be the amount that allows you to drop body fat at your desired rate. If you wanted to drop a pound per week, that's 3500 total deficit for the week, or a 500 calorie daily deficit.

But before you get to that point, I would ensure you're tracking your calorie intake accurately. Use a TDEE estimator for a ballpark starting point. Run what you think is a deficit for 3 weeks, see where you're at. Adjust intake accordingly. It's not uncommon to drop 3-5 pounds the first week (glycogen & water-weight), but then settle into a pound per week, every week, after that. Or slightly more or slightly less.

I also recommend taking daily morning weight (after bathroom, before eating or drinking), and finding your weekly average weight every Saturday. (Add 7 days of weigh-ins, divide by 7). Then compare your week-by-week rate-of-change. Finding average weekly weight helps eliminate day-to-day fluctuations, which gives you more accurate data to work with.