What I do is I only turn on my metronome in speaking situations, I speak normally then everytime I feel I am about to block, I immediately shift my thinking to feel the vibration on my wrist and time it with my speech to unblock any speech blocks, what I also do is I deliberately keep looking at the people I speak to into their eyes, and this somehow made my speaking more and more comfortable and made me more present in speaking situation by practicing it. I also noticed that even normal people cannot maintain eye contact.