My hair used to be 3A type curly. But now it is less curly and flats. Can I get it back, and how?

I have long hair. It is medium brown with blond highlights. I suppose it used to be more layered than now. I also didn't use sulfate free shampoo. It also gets tangled on the back. When I wash it it is nice but not as nice as it used to be and not for long.It would be so helpful to me if I could get some advices on how to get my hair back as it used to be. If someone had experienced the same problems please share how you overcome that problem. 

1 Answer

just stopppp using any chemical you are using.