I wanted to work on my enunciation as well, in addition to loudness, cadence, nasality etc. My speaking style is staccato, and I emphasise too many words. That she corrected by telling me to read from a fully prepared script if I could help it, which is useful for recordings in these times! That got rid of the staccato, because my low-bitrate brain was freed from having to figure out what clever thing to say next :)
Then to work on the cadence, I had to underline at most two words per line, which would most effectively deliver the import of that line.
Finally, breath control. "Speaking from the diaphragm" is a real thing. There's a daily regimen of vocalization and breathing exercises that I do. My neighbors look at me oddly. But these exercises do help. Good breath control allows you to deliver a long line, with appropriate pauses and cadence, without feeling your tank is going to empty soon.
I've also noticed when listening to a presentation that some presenters are a lot easier to listen to. I'd like to improve my presentations in that way - that means tone, pacing, enunciation, etc.
Most useful tip he gave me: in between sentences focus on breathing out, instead of breathing in. If you clear your lungs they will take care of filling up automatically.
Would definitely be interested in some coaching and zero interest in singing. I wonder if it’s something you can do via zoom? Especially these days ...