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I am not sure i understand you question since you gave two fixed values to x and x1. If you want to find the limit of the function some_function = (z -> z*z1) when z goes to z1, you can define a symbolic variable z function :

sage: z1 = 3 + 4*I
sage: some_function(z) = z * z1
sage: some_function
z |--> (4*I + 3)*z
sage: some_function.limit(z=z1)
24*I - 7

I am not sure i understand you question since you gave two fixed values to x and x1. If you want to find the limit of the function some_function = (z -> z*z1) when z goes to z1, you can define a symbolic variable z function (not to be confused with a python function) :

sage: z1 = 3 + 4*I
sage: some_function(z) = z * z1
sage: some_function
z |--> (4*I + 3)*z
sage: some_function.limit(z=z1)
24*I - 7