Tastes vary according to culture, age, trends, season, food availability, and personality. I always encourage you to try something a little teeny bit outside of your comfort zone...
SOME OF MY FAVORITE FLAVOR COMBINATIONS:
chocolate . caramel . sea salt . espresso
chamomile . ginger . honey
lavender . kalamansi . brown butter
cabernet . chocolate . hibiscus flower . raspberries
vanilla bean . cinnamon . rose
earl grey tea . orange . chocolate
almond . passionfruit . pistachios
chocolate . cranberries . blue cheese
chai tea . feta . burnt caramel . roasted apples
jasmine flower . matcha green tea . black sesame . coriander
coconut sugar . coconut cream . coconut flake
My cakes are not too sweet. I believe flavor should be celebrated--72% chocolate, Meyer lemons, cream cheese, vanilla beans... not sugar, so I don't use it where it's not necessary. Let the raspberries speak for themselves.