When it comes to finding effective ways to communicate a message, there are many synonyms that can be used to convey this. Some common synonyms for "show great effectiveness" might include words like "demonstrate efficacy," "prove successful," "yield high results," or "deliver strong outcomes." Other possible synonyms for this phrase could include terms like "achieve effective outcomes," "produce desired results," or "offer reliable solutions." Ultimately, finding the right synonym for a particular context or situation will depend on the intended meaning and the tone or style of the communication. However, by exploring a range of alternatives and synonyms, it is possible to find the perfect way to express the effectiveness of a particular strategy or approach.