"So much the better" is an idiom commonly used to express positive feelings about a situation. There are several synonyms that can be used to convey a similar sentiment, such as "even better", "all the better", or "more reason to rejoice". These phrases are often used to express enthusiasm or approval for a situation, and indicate that something is even better than expected. Other synonyms for "so much the better" include "it's a bonus", "fantastic news", and "great outcome". Regardless of which phrase is used, they all communicate a sense of positivity and celebration, making them useful in a variety of contexts.