How can I get my parents to give me my freedom again?

My parents were abusing drugs about six months ago. My mom got me kicked out of my grandma’s house and then left me at my friends houses all sumer. I got calls from my mom’s boyfriend every once in a while, but she wouldn’t talk to me. Now they’re both clean, and my mom’s pregnant, but she’s still smoking cigarettes and drinking once in a while. They let me have a lot of freedom for a while, and do things I shouldn’t have been doing, but all of the sudden they grounded me for months and I’m not allowed to even leave the house without them. What do I do to get my freedom back?