I confess to not having listened to the clip at all, but I would caution you against using a classic text, such as Shakespeare's Richard III (if it is that version you are reading).
The pronounciation of Shakespeare, even today, is, at best, stilted. It has a certain rhythm and style, that, while recognized for its excellence, is not at all common in everyday speech today.
Any judgement we were to make on your interpretation of this text will be coloured / biased by what we expect Richard III to sound like.
I would suggest instead your reading something from Harry Potter, for example.
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