Is there a way to flip/reverse a surge function?

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I am trying to fit a model for the data points (in blue) using a surge function, but do not know how to make it so the function's maximum is farther down the x axis. Is there a way I could flip the function or something so that the local maximum is in the same area as the blue points? If not, is there a function or equation that anyone recommends would fit properly? function and points