I am 6'tall and weigh too much(259). and walk 2 miles a day 4times a week. It just doesn't seem to come off.
Just remember you don't have to do this alone and what works for one person does not always work for another.
I'm working with a dietician and weight loss doctor. I'm also open to weight loss medications and am currently on Metformin (also used for pre diabetes or Type 2 diabetes). My BMI was 34 when we started and is now down to 33. Honestly, if my BMI was 35 or higher, I would qualify for gastric sleeve surgery and would pursue that. But I refuse to gain wait for that reason. The weight is slow to come off, but honestly I'd rather make small lifestyle changes that I can handle and continue for the rest of my life instead of being overwhelmed with trying to do too much and give up entirely. So I'm working on what I eat, how much I eat and exercising.
If your insurance plan doesn't cover weight loss management, I would highly suggest Noom. My husband and I did that the beginning of last year and lost weight. You learn some great ways to retrain how you think about food and eating. My BMI then was just over 35 when I started that.
Recently my doctor and I were talking about my exercise. I have an Apple Watch and told her how I monitor my heart rate when I walk and try to get it up to certain ranges. She asked what my heart rate usually is, did some calculations and said, on what I consider my "shorter walk" days, my heart rate was in Zone 2 most of the time. She said there's a lot of research and data coming out with that.( To get your Zone 2 heart rate, subtract your age from 220, then calculate 60-70% of that.) She said research is showing athletes that worked out quite a bit in the Zone 2 heart rate had more stamina than others - like in long distance marathons (?). The other thing that doctors are finding out with Zone 2 is your body creates more mitochondria and improves mitochondrial health....and other things. Here's one website that helps explain it:
https://www.mindbodygreen.com/articles/zone-2-cardio