In my opinion, good writing comes from reading good writing.
I can see how reading the execrable Watchtower publications could scar you for life!
However, if you can get your hands on whatever represents the finest representation of good Academic Writing,
why couldn't you reverse engineer it with a view to what sets it apart?
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I have a friend with a remarkable skill as an etching artist.
He entered several of his etchings in an "art judging event" at the local bank.
His work received 3rd place and he was bummed out.
"How could those amateurs who did such obvious things win out ahead of my work?"
I told him this:
"It wasn't your work not measuring up which brought that result. It was the judges (employees of the bank) demonstrating
their personal preferences."
He looked quizzically at me, "What's the difference?"
I told him, "Don't you think a wine connoisseur makes different choices than does an ordinary Joe-Six-pack?"
"Yes."
"That's all that's going on. Different kinds of people have different levels of expectations, tastes, and standards. End of story."
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A rigorous list of "Academic standards for an Essay" would be your first order of business.