- Like what you've got: Reconsider. Not that the D2h is a bad camera, but at 4mp it is now easily beat by current DSLRs, including the D500, which shoots faster.
- Dislike what you've got: Update. Realistically, only a used D3/D3s or D4/D4s, or a new D5 or D500 will likely make you happier. But other than the D500 you'll be realigning your lens collection from DX to FX. Note that the D2h was DX, and the pro equivalent in DX is now the D500. That's a very good choice for you.
- Upgrade to mirrorless: Z8 or Z9, but you’ll be changing from DX to FX lenses.