Self Development Recs / Communication or Prof. Speaking courses

Hi -

I’ve been the MM space for the 4 years, dedicated to up leveling and am seeking practical advice on improving my communication skills and or professional speaking skills.

I aim to be in the top percentile and I’ve observed the most successful ENT AE’s and these skills are the common denominator with all!

Any recommendations that anyone has personally invested in and what were the results from the investment?