When writing or speaking about a particular topic, it can be helpful to use a variety of synonyms to avoid repetitiveness and keep the audience engaged. Some possible alternatives to the phrase "on this subject" include "regarding this matter," "pertaining to this theme," "in relation to this topic," "concerning this issue," and "with respect to this subject." Incorporating these substitutes into your language can make your writing more diverse, captivating, and effective in conveying your ideas. Whether you are crafting an essay, giving a presentation, or engaging in conversation, using synonyms for "on this subject" can elevate your language and enhance your communication skills.