Stress definitely impacts our fluency. I'm not going to give life advice because that's not even remotely under my purview, but you're right that if things in your life improve, your fluency will follow. I'm of the mind that most often, adult stutterers will benefit more from psychological therapy than speech. If you have the means to do that, perhaps it might help. As for speech specifically, I recommend talking a lot. It's exhausting and takes a lot of work, but the more you speak, the more fluent you're going to become. We have the habit of avoiding speech wherever possible and it doesn't do us any favors. If you really sit down and think about it, I bet you could instantly find at least a dozen situations where you could speak, but don't. Challenge yourself to speak on some of those, start small, build your awareness of the fluency you do have and the confidence to overcome the fluency you don't. It's not a one-time thing. Maintaining peak fluency is a constant maintenance gig. Establish a routine of working on your speech daily, by reading aloud to someone (or even just yourself) or calling a friend for a conversation.