A tip from an average American:
Although a few vowel sounds are off, your words are understandable and those clipped consonants of the RP accent are helping with that. But there's a singsong quality to your speaking (at least in this reading) that seems to not only cause you to sometimes accent the wrong part of a word, it also overrides the usual emphasis on the most important words. Talk to your coach about how to break up the rhythm, lean on the words that make your point, and whip past the rest, while also using higher and lower notes πΆ for expression. In English, a word can be spoken with different tones depending on how it's being used in the sentence.