"Am conditional upon" can be replaced with several synonymous phrases to convey the same meaning. "Contingent on," "subject to," and "dependent on" all indicate that something is conditional and relies on certain circumstances or factors to be met. "Hinging on," "predicated on," and "conditional to" also express that something is conditional and requires certain criteria to be fulfilled. Additionally, "conditioned by," "bound by," and "restricted by" convey a similar sense of being dependent on certain conditions or limitations. Selecting the appropriate synonym for "am conditional upon" can vary depending on the context and desired tone, but all the above provide options to clarify this conditional relationship.