I've studied Japanese for a long time (and work in Japanese only now) and if you want to work on pronunciation I learned to "shadow" in my Japanese class. You watch any tv show and you repeat exactly what they say right after to get the intonation down. It's weird at first but it's super effective due to the difficulty of Japanese's hidden intonations.
One other thing we learned was to talk real loud with either a high or low pitch as it helps you learn very quickly the proper pitches. I heard news casters in either Japanese or American news casters do this.
Working in Japanese only means you’re located in Japan? What’s your line of work? Just curiosity.
One nice big feedback loop!