Hedging is a way of using language to make an argument more effective by softening or strengthening it. An idea expressed without appropriate hedging may seem too general, too confident, or too extreme. Specific vocabulary and writing strategies can be learned and used to hedge appropriately.
Longer is not always better! Limit your sentences to a few clauses, and alternate long sentences and short sentences. Academic writing in English tends to have long, sophisticated noun phrases, but it is not a requirement to include complex sentence structure and long strings of joined clauses.
Attempt to cultivate objectivity. Objectivity is an overall goal in academic writing, even if the goal is to convince the reader of something. It demonstrates that the emphasis is on the object – your writing, your research – not on you yourself.