To make your text appear more professional and convincing, it is important to write business-like. What does that mean?
Objective, factual - Try to leave out personal value judgements (whether you think something is fascinating, good, bad, etc.) and remain as objective as possible in your report. Support your opinion with facts or advise from experts.
Specific, concrete - Avoid vague words, such as "maybe", "really", "a bit", "a lot". Try to make things clear with concrete examples and specific numbers, for example.
Impersonal - Avoid personal pronouns such as "I", "we" and "you" (except to express your personal opinion). This also makes the text more objective.
Formal - Beware of colloquial language and especially slang.
When writing, think of the style of an objective news article, not a personal diary entry.
Compare the following two sentences:
"I think Mac OS is the very best operating system."
"Mac OS is less attacked by hackers than Windows (Haslam, 2019)."
Which elements make the first sentence less business-like?
Which sentence is more convincing?