given your specific situation with presentations and phone calls, you might want to check out Better Speech since I've seen it come up a lot for adults working on fluency issues. They offer virtual sessions with licensed SLPs which seems like it'd be way easier to fit around your work schedule than trying to find someone local, and from what I've read people have had good experiences working on breathing techniques and presentation anxiety with their therapists. Sounds like you already know what works for you from your previous therapy, so having flexible access to a professional who can help you get back on track coudl be really valuable at this stage in your career.