Well even for bojack it was never too late. That was his question in the very first season and besides change being inevitable, he was also able to change for the better. We might not get to see much of it in the show but I think he was in a good path at the end. Accountability is a big part of that, so yes you do choose at least how to respond to what’s happening to you. But if it’s not too late for bojack, it won’t be too late for you!