Also, I mean this politely, but do your glutes, as your backside is going flat which indicates a lack of muscle. I hope that doesn’t cause offense, simply our glute muscles are key for stability.
for me, I find squats are good. However I also go to the gym, and do the cardio machines at high resistance, I found these worked my thigh muscles more though, so have now built in squats, I can now do low sitting ones with ease, and can see the difference in my backside.
the first time I did them I was in agony for days after, now I need to do about a hundred to feel it the next day, there is also free weight exercises you can do, and you can google these, but for at home, with ease, start with squats.
sadly as we start to lose weight, everything doesn’t just snap back, we also need to build our muscles back up in key areas.
I do alternate muscles each day, so an example will be today core, tomorrow glutes, the next day core, to allow recovery time. Advice differs, some even think once a week is enough, some every day, but this works for me,
plus things like core and squats you can do at home very quickly. You will find your muscle strength comes on quickly. In a couple of months, you will be able to do much more than you can today. And our muscles are like the clothes hangers, they hold our skin and fat up for us.