There is a wide range of synonyms to indicate the idea of "improves in mood" that can be used depending on the context and the level of intensity required. Some of the common synonyms for this phrase include uplift, cheer up, brighten up, perk up, gladden, boost, enhance, elevate, and enrich. Other possible synonyms are ameliorate, refine, better, progress, develop, advance, or rejuvenate. The choice of the proper synonym will depend on the tone of the message, whether it is formal or informal, and the level of expressiveness required. In a nutshell, choosing an appropriate synonym will improve the clarity and effectiveness of the delivered message.