Everyone “should” be eating ~1.5g/lb of protein per day, but the lb part of that equation should be tailored to your target weight, not necessarily your current weight. Fats and carbs tailored in the same way. That way, your potential calorie deficit is keeping your body structurally sound for what you’re aiming to weigh….If you are loosing weight then you aren't eating enough. Try to eat 1.2-1.6 g/kg of protein in a day. Add healthy fats and good carbs for each meal. Move more try to get your steps in for activity level, resistance exercise is ideal if you can do it.
You don’t want to be eating the proper macros for your today weight and trying to induce a calorie deficit solely by increased activity, because every pound you lose becomes harder to lose the next as your body becomes more efficient at the work you do (but I agree w/Pablo that resistance training however you get it is essential). By eating your target weight macros, you give your body a “free” calorie deficit vs your today weight that automatically tapers off as your regular amount of activity finally balances out with your calorie intake.
This gives you a “soft” landing with much less opportunity for rebound weight gain after stopping the additional expenditure you had added in order to lose weight, and also has a psychological effect as well. If you busted your tail to lose “x” pounds and did it by excessive restriction or excessive expenditure to get to that weight, nothing will kill your morale to see pounds adding back up on the scale after you got there.
It’s how places like WW & JC and an entire industry make billions per year, by teaching unsustainable habits that result in a rollercoaster on the scale. JMO, but based on insider experience; I didn’t change my activity levels one bit, am down over 80lbs & counting over 18 months, and all I changed were eating habits and the timing of ingesting those calories.
My doc is flabbergasted at how great my bloodwork is without any meds at all, despite the scale still being more than it should. Considering where I had allowed my body to get to 18 months ago, I don’t think anyone could disagree that this plan has worked for me, and likely far better than anything a doc would have had me do.