Walking weight loss help needed

Just started out on a tread mill
have bought the heart monitor 41 years old
figured out 179 max heart rate
been doing 15 minutes at 4 kilometers
then going to 5 deg on incline and 5 kilometers for 5 minutes.
then 20 minutes at 8 incline with 6 kilometers of speed.
at first my heart rate is at 62 resting
up to 93 after first 15 then 115 at 5 kilometer rate then for the next 20
were i push it 8 incline with 6 kilometer my heart goes to 142 to 153.
I have been doing 4 days straight of this then riding my
bike for 4 days to work. my heart rate while riding
is from 100 to 126 the ride is 6 kilometers in distance in the morning then
back 6 kilometers at the end of the day.
any sugetions I have stopped for the most part all meats except maybe 4
portions a week of chicken and 1 portion of beef a week. I have been eating
20 ornges a week and also salad. protien bars.78 grams with 24grams of
protion and 36 of carbs.in them.about 3 a week.
I started out at 269 lbs in feb this year
and early may weight is 232lbs.
as of today i am still around 229-231 lbs. it seems like i have hit a wall
on the weight loss. I can know see some of my abs . when I calculate my body
fat by height and weight it is the number 30 meaning overweight.
I have a large framed body 6 feet 2
Any ideas
Fawnsaprk