Calorie deficit

Hard to answer.

In general, the less you eat, the faster you lose, all other things equal.

Trouble is, other things can't possibly be equal.

Why? Humans are dynamic systems. If you severely under-eat, natural selection (over millennia of more famine than surplus) has installed physiological responses that down-regulate relatively less important bodily functions as calories drop lower and lower. "Relatively" is the key word.

At too-low calories, you'll burn fewer calories in daily life, perhaps without even noticing: Fatigue. lassitude, exercise-underperformance. Hair might thin. Fingernails might weaken. If really unlucky, you'd lose more muscle mass than necessary, maybe experience gall bladder disease, maybe weaken immune system (especially not great in the middle of a pandemic), and other pretty bad stuff. Even things like heart failure are at an extreme of that spectrum, as this thread will illustrate:

https://community.myfitnesspal.com/en/discussion/10761904/under-1200-for-weight-loss/p1

Best idea, IMO: Get a calorie goal, stay close (say +/- 50 calories or so) on average, the overwhelming majority of days. Get decent nutrition. Stick close to the calorie goal for 4-6 weeks (whole menstrual cycles for premenopausal women, which I understand you aren't). Then, look at average weight loss per week, and adjust intake so you're losing 0.5%-1% of current weight per week, with a bias toward the lower end of that, especially if less than 25-50 pounds to lose.

Losing too slowly is frustrating. Losing too fast increases health risks. Pick your risk tolerance.

Try a week or two at .5 a week and see? Does it work? If you lose half a pound, then do it again. If not cut a bit more off, and try another couple of weeks. There is no rush, if you go down, then great, if not adjust and go again.

You could cut and aim for more, but go too far and you make your life too hard.

It is about finding the balance, between deficit and hunger. Too far and you can make life miserable, that is pointless