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Storyworthy by Matthew Dicks is a good start. https://www.amazon.com/Storyworthy-Engage-Persuade-through-Storytelling/dp/1608685489
What I find helpful in improving speaking is:
1. Reading aloud
2. Writing, you can check this post about writing: https://www.reddit.com/r/LearnJapanese/comments/s9zz3d/i_wrote_146_writing_samples_in_2021/
Of course, the execution can be difficult and there's a problem with getting feedback. How to overcome some of the issues:
And finally, what to write/speak about?
Two things:
Good luck!