The phrase "spread oneself" can be difficult to find synonyms for because it is a unique expression that means to extend oneself too thinly or try to do too many things at once. However, there are a few alternative phrases that convey a similar meaning. For example, "juggle too many balls," "overextend oneself," or "stretch oneself too thin" can all be used to describe the act of spreading oneself too thin. Additionally, "take on too much," "overcommit," or "bite off more than one can chew" are all related expressions that describe the same concept. Ultimately, the best synonym for "spread oneself" will depend on the context and intended meaning of the phrase.