At first you'll stop losing and may even "gain" a little back. If you've been undereating for too long your metabolism will need a bit of a kick in the pants. Just train hard. Lift hard and do some interval type training a few times a week to burn calories. After a couple months if you aren't losing about 1lb a week, drop a few calories, but just enough to lose a little more. This progressive type of cutting is what will keep things moving later on when you've lost a good amount of fat but really want to lean out. That's when you bring in the big dogs like keto, cyclical diets and nutrient timing.
Current PRs at 242- 495, 345, 585, 1425