If you strive to provide a successful SOP that will make a good impression, make sure to avoid the following:
Writing in a too informal manner.
Using clichés and jargon.
Making grammar and punctuation mistakes.
Using too many contradictions.
Sharing opinions that are too strong.
Discussing controversial issues and topics.
Being unfair with your results.
If you think that a statement does not fit the paper, do not write it. Revise the work several times to make sure it is flawless.