Walking on pavement is fine. Change the terrain to challenge your body and lose weight. "Anything with rolling hills (or severe slopes) can improve calorie burn,"
walking quicker burns more calories. If you want to lose weight walking, use speed bursts. "If you can jog a few minutes, that's even better—but just altering your walking speed will also have an effect."
Have you tried "rucking," or weighted backpacking? "Rucking is walking or trekking with a weighted backpack. When you become used to it, you can add extra weight to maximize your burn on future walks."
Walking for weight loss with a friend will motivate and hold you accountable. Catching up will be fun too. Walking with a friend may not burn more calories, but it ensures that you actually walk.
While walking, use your arms too! Pumping your arms while walking doesn't burn the most calories, but any activity helps.
This weight loss strategy can be used throughout the day, not only during walking. Read advises taking the steps instead of the elevator or escalator for errands and apartment visits.