Remark upon is a commonly used phrase in the English language which means to comment on or discuss a particular topic or issue. However, if you find yourself overusing this phrase, there are several synonyms that can be used interchangeably to help you diversify your language. Some examples of synonyms for remark upon include, but are not limited to, comment on, discuss, mention, note, observe, state, think, and reflect. Each of these synonyms has a slightly different connotation, so it's important to choose the right one depending on the context and tone of your writing or speech. By using these synonyms, you can add richness and variety to your language, making your communication more effective and engaging.