Change up your exercises, working different muscle groups on different days. Usually this means shoulders, biceps and triceps together on one day, abs and back on another, butt, calves and thighs on a third, then back to shoulders, etc. Might want to do abs, etc. 3x/week and the others 2x week so that you get in an extra dose of abs and also are doing something that you can schedule on a weekly basis.
I'd also advise more aerobic exercise. Strength training is good, and it's important, but if you want to burn calories, you need to move. Might want to mix it up if you can, e. g. with swimming, hiking, tennis or something other than/in addition to walking.