if you like stouts:Try for a slight variation in porters, brown ales, brown mild.
Do you like ipas, try a dark ipa?
Wheat beer? American wheat? Try a citrusy summer wheat ale. Hefeweizen?
What about belgians? Do a nice dubbel or tripel. Then with some fruit, cherry maybe?
Belgian style brown ale. Belgian porter. Belgian wheat ale.
variations on the styles you noted.
make a big batch of stout. then either split into seperate smaller fermenters, or a primary and separate secondaries.
Stout combinations of: Chocolate, vanilla, coffee, cherry, lactose, chili, oatmeal, irish, session stout, oak aged, bourbon, rye, mint, peanut butter, other fruits, coconut.
Creme brulee stout (more caramel, and caramelize the lactose slightly).
Take 1-3 of these options and see how they work out for your tastes.
Wheat: try some regional wheat styles. Belgian, saison, germen hefeweizen, american wheat. Add fruit, oak aged, coconut, or chili maybe.