Fewer deities above demideity rank, but more responsibility for each. Especially for evil deities.
Churches, that is. The deities themselves are of secondary interest. Evil churches are good organizations to pit the PCs against, but I like it better if they have more influence than they currently do. Especially among nonhumans.
Fewer nonhuman deities, period. Humanoids should mostly worship the same deities as the humans, maybe under different names and with a different appearance (e.g., Gruumsh could be a sock puppet of Talos or whatever).
A lot of that requires messing with history, though. Maybe I should just make some much-needed changes and leave the rest alone.
Hey, just thought of something. *gets Netheril campaign setting* That's a better start than taking the modern-day pantheon and starting to cut deities away...