Definitely possible, you’d be looking at 40-50 pounds in 24 weeks, or about 1.7-2.1 pounds a week. Thats a little bit more on the aggressive side of a deficit, but it’s definitely possible if you’re smart about it and are disciplined. Biggest recommendation is to track your calories. Buy a food scale, download an app like cronometer (it’s free) and set a sustainable deficit. Eat mostly whole foods to keep you satisfied, and set a realistic step count to hit daily.