Sagging skin!! Can anything help it?? Possible hernia as well?

So I had my second baby three months ago and I was HUGE with him. With my first I was so so tiny. I still had a tiny bit of sagging but it wasn’t noticeable unless I sat. But holy crap my son was huge and I was huge and now my body is ruined. I’m 20 so I’d like to be able to wear cute bikinis and feel confident and love my body. I’ve looked into derma rolling and I’m going to try that as well as some oils. I’m actually very skinny it’s just the skin is so loose. I also have diastasis recti abs may have a hernia. You can see the weird lump in my tummy, I’m going to get an ultrasound to confirm. But yes my tummy is very very sore, my muscles are worn. Has anyone tried derma rolling? Or literally anything? I’m already having to go for breast reduction so I don’t want to get a tummy tuck. How bad would you say my loose skin is? Advanced, minimal?? I just want to do my best to fix it. And I know I should love myself no matter what and I will but that doesn’t mean I can’t want to make it better :)

Also you guys see that lump in my tummy right??? Does it look like a possible hernia? It’s very soft but extremely sore to press on. My doctor really has no clue so I’m going for an ultrasound but I don’t know what else could be causing a lump like that