The phrase "play part of" is commonly used to refer to an individual's involvement in a particular activity or role. However, there are many synonyms that can be used to convey a similar meaning. For example, one could say that they are "participating" in a project or "contributing" to a team effort. Another option could be to "take on" a certain responsibility or "fulfill" a specific role. In some cases, an individual may also "assume" a particular task or "undertake" a certain role. Regardless of the specific phrasing used, the key is to communicate that one is actively engaged and making a valuable contribution to the group or situation at hand.