There are several synonyms for the phrase "high interest." It could be referred to as a "top-rated" or "well-regarded" topic or item. Another option could be to describe it as a "hotly debated" or "controversial" subject matter. It might also be deemed as a "popular" or "trending" matter that is of great importance. Other possible synonyms for high interest could include "in-demand," "highly sought-after," or "compelling." Regardless of which term is used, it is clear that this phrase conveys a level of significance and relevance that is worthy of attention and consideration.