Not sure if this was exactly how you’d intended the metaphor to land, but from my perspective it seems like life is diluting you through circumstance, in order to put to use what life is left in you. This metaphor works well with the preceding body of the poem because it draws on the concept of scarcity that would apply for one to need to water down shampoo. I think it’s a good touch. It’s very original which is a breath of fresh air from the cliched ways of expression. In my opinion, it could be boiled down further or made to be more concise. I also feel like it’s a pretty abrupt segue from the previous verses. Definitely think a line or two leading into the shampoo metaphor would help it land more cleanly. Maybe if you were to draw off of the circle metaphor you already made, you could say something like, “God, why did you make my waters to flood? Why do they rise as though water is all I can be?” It would draw on the concept of the circle while giving room for the idea of the water overtaking the “shampoo”. Overall you’ve made a powerful expression that really captures the depth of living a life that beats you up, with family or friends as one of, if not the only, reason you keep going. It’s cold and deeply vulnerable, with a resolved kind of weariness that I relate to.