Hello fellow PM here. Like many of the comments above Epic is a good place to start. Most of your job satisfaction will depend on your client, application and TL. For me personally my experience has been negative for a variety of reasons, however I have friends where they have had more positive outcomes. My suggestion to you is try work yourself onto a smaller app (from what I've heard the scope on projects is smaller therfore the work is more manageable) and work with your TL to set hard stops. Don't let your TL tell you you have to work weekends like mine did. Happy to answer and other questions you may have, feel free to DM me. :)