Hate to tell you but the only way to get rid of loose skin is surgery. Sad but true.
Think of your skin as a hair band you’ve stretched out from lots of use. Ain’t nothing going to make it shrink back to how it was when it was new. Your skin is elastic too.
How much loose skin you will have depends on many factors: age, gender, highest weight, how long you had been obese, genetics, etc.
Doing weights will help fill in some of the loose skin & strengthen & refine your underlying muscle structure but it won’t make the loose skin disappear. Most of those ‘beauty’ type treatments like needling, radio frequency, uv lights, etc. only offer temporary fixes. Stop them & the effects disappear.
When you near/reach your goal you may look a little gaunt but don’t worry this does improve. For about 12 months after I reached goal (& when I kept losing) ‘well meaning’ people often asked me or my family if I was unwell. But once I stabilised about 7 months ago, the comments stopped. My remaining fat seemed to redistribute. My butt isn’t quite a saggy & my face looks fresher & fuller. So don’t rush off to do drastic treatments. Give your body a chance to settle.
I rather have my loose skin then be the weight I was.