You are not meant to limit your calorie intake when doing IF, a caloric deficit will wreck your metabolism, then you will put on more weight on the same amount of food you could lose or maintain on before, that's why diets don't work!
so let's say you could eat 1800 calories per day without putting on weight, you start eating 1200 per day to lose weight, you will initially lose, but then your body will adjust your metabolism down, so that now you don't lose on 1200 and would put on weight at 1800, to lose you now need to eat only 1000, say.
Then when you have finished your diet, you go back to what was normal for you, ie 1800 calories per day, with your new metabolism that will be a disaster! You'll have to stay on 1000 a day for ever when before you could eat up to 1800, or pile the weight back on!
Do IF, 16:8 is more of a maintenance protocol for me, but it's great you lost on that
Eat balanced meals up to your caloric requirement, NOT a deficit, eat good healthy whole foods, do it for the rest of your life!
Exercise for health, but don;'t expect it will help that much for weight loss, but of course, you'll gain tone and muscle mass and it's just really good for you!
Also, longer fasts, 36-48 hours have significant health benefits, I do them regularly, not to lose weight, I am not overweight, but for health!