Nutrition question

I am 23m 185 lbs 6’. I started about 2 months ago at 195. I eat about 160g of protein a day, < 60g of fat and total at about 1500 cal a day. For the past 3 weeks I have hit a wall. I strength training 4-5 days a week and do inclined treadmill walk for 20 min 3 x a week. My lifts still feel good and I feel like I am still pushing more weight but my weight loss has stopped. I fear I am eating too few calories and my body has adjusted to burning less. Does anyone have any tips. Should I increase to maintenance calories slowly over the course of a month and then back it down to ~1900 cal a day? Any help is appreciated