how big of a deficit are you on?
slim waistline = losing fat = good lor...
losing weight doesn't necessarily equate to losing fat. Since you're lifting you might be gaining muscle as well hence the stagnant weight?

don't worry too much about your weight if you're lifting. Just take progress pics once every 2 weeks (same pose same lighting) and compare...

Assuming 300 cal/day deficit from your TDEE, 300x7 = 2100 cal/week.
1 lb of fat = 3500 cal. So (hypothetical calculation) you should be losing 2100/3500 = 0.6lb or 0.27kg a week.
6 weeks * 0.27kg / week = 1.62kg...

This is all hypothetical calculation but also your body weight will fluctuate daily depending on water intake, carbs, poop...lol

I used to be in same boat as you where weight drop was stagnant for weeks. What you can consider doing is carb cycling. Eat way more carbs on heavy lifting days (to prevent your metabolism from slowing something something glycogen fuel #broscience) and then go low on carbs when you're not lifting.

1st check if you are really eating that deficit. Did you calculate wrongly. Sauces etc are those small stuff that adds up. How much calorie are you eating now at what weight and lean muscle mass %?

Though I do not recommend going to 1500kcal a day, but if you have no choice no other way, do it till the loss go stagnant again. Eat at maintenance for a week or 2 after that then go on a cut again. You will be surprised by what you can get by eating more.

Yes. Going too low is not a smart way. I was at 1400kcal for a year. Stagnant for at least 6 months? And yet I was too afraid to eat more because by logic eating more makes you go fat again right? I gave up at one point. I said fuck it, lets eat more to lift more, at least I can brag about the weight I move. So I go do that gradual increase to be on the path of eating at maintenance. So I increased from 1400kcal to 1600kcal. The first week, the scale moved. I am starting to loose fats again, fast. After a month, I increased to 1800. It goes on to loose even more. So yeah. I ate at 1400kcal not loosing. I eat at 1800 I loose more in 3 months than that total 1 year at 1400.

I think u need to step back and recalibrate yr tdee. It should not be that low for a starter. Fat loss shud start at the highest possible calories n go from there. 1800 within a few weeks is just setting up for failure.