The sentence that uses a subjective pronoun correctly is the first one - Laura and I have written an original play for this year's festival.
The second sentence is incorrect because the word him is not subjective, and neither is her in the third sentence, or them in the last one.
anapestic
Anapestic is unstressed, unstressed, stressed. un-der-STAND he's the ONE in the CHOIR.
Answer:
In the first part
"Dear future me,
This is what I want you to know
You used to always cover things up
But now the world's gonna know"
Maybe change the last know (bolded) to "be aware", "realize", or "see"
Explanation:
It sounds repetative. Despite that, very good poem! :)