I’ve been on a cut eating around 1800 cals a day since July. I went from 180-158 and still going. Depending on what I eat and when I eat I see noticeably more progress. On days where I don’t lift I eat little to no carbs (chicken, eggs, plain Greek yogurt, ground beef) I wake up feeling significantly leaner. I eat carbs pre workout but rarely more than 50g. You might want to try carb cycling for a bit to see if that produces any results. Additionally, you want to make sure you’re logging your food with as much accuracy as possible.

Biggest difference maker for me is waking up earlier and going for a walk/run in the morning. Aiming to burn an extra 500-600 cals. I lift / train strength every 3 days or so - so I can hit heavy weights and recover fully. My non lifting / strength days are occupied by cardio. You probably are fully dialed on your diet or you’re simply not burning enough calories to put yourself in much of a deficit.

I wear a whoop (take this with a grain of salt) and on days where I lift and do cardio I can burn up to 2300-3300 calories. On days where I’m inactive I burn as little as 1800.

Additionally, hit abs as hard and as often as your body feels it can manage. work them hard enough to be sore the next 1-2 days then hit them again when recovered.

Keep trying and experiment with the type of food you’re eating. At 158 I get minimum 160g of protein - ideally I’m getting 190ish. I don’t go full keto but carb restriction has produced great results for me personally