I have been eating 1700-2K calories a day for the past 6-7 months along with a light increase in my daily physical activity (30-45 mins 4/5 days per week on the walking pad, bowling one night a week, taking over grocery shopping for my wife, etc) and am down 65 pounds.
It's all about calories. No need for Ozempic, Keto, Adkins, Weight Watchers, etc.
Calculate your daily calorie usage with a tool like
this, recalculate it every month to a month and a half, and make sure to always stay BELOW that number. The more you are below that number, the faster you lose.
Also helps to eat a higher percentage of your calories in protein as opposed to carbs as well, but ultimately just being mindful of your calories is key.