SUB-D modeling- getting a even convex surface connected to other surfaces

subd.3dm (429.6 KB)

The curved surface on the top needs to be smooth.

you have way way way way too many edges in this model and especially in the top, delete some edge rings, you only need three. (maybe 4)
(see rule of three here- Rhino 7- SubD, Rule of Three - YouTube)

you may also want to aim for a quad ball topology as opposed to a radial singularity topo as you have here

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