"Level the playing field" is a common idiom that means to create equal opportunities for everyone in a particular situation. If you're tired of always using the same phrase, there are several synonyms that you can use. "Equalize the odds" is a great alternative that implies that you're making sure everyone has an equal chance of success. "Even the score" can be used when referring to a competition or game. "Remove the bias" is another option, and it suggests that you're removing any advantage for one party over another. "Bridge the gap" is also a great way to describe leveling a playing field, especially when talking about differences in resources or abilities.