When it comes to expressing the phrase "have a lot to do with," there are several synonyms that can be used to convey a similar meaning. Some examples include "be closely related to," "have a significant impact on," "play a major role in," "have a strong connection to," and "be heavily influenced by." These synonyms highlight the idea that something is connected or linked to another thing and that it has an important effect on it. By using these alternatives, writers and speakers can add variety and nuance to their language, making their communication more engaging and effective.