When expressing a cause-and-effect relationship, the phrase "for this reason" is commonly used. However, there are numerous synonyms that can be used to convey the same meaning in a more sophisticated manner. One alternative is "due to this", which emphasizes the causation between two events. "As a result", "consequently", and "therefore" are all effective in indicating that a specific action or event was caused by the one preceding it. "Hence", "thus", and "accordingly" all indicate that something logically follows from a previous statement or situation. By avoiding repetition and varied your word choice when expressing causation, your writing will appear more refined and clear to your audience.