Your well whiskey is likely to be similar to Seagram's 7 crown (in taste and quality), so you've basically reinvented this:
https://en.wikipedia.org/wiki/7_and_7 By the way, as far as I can tell, this is a common drink and your only variation is the addition of bitters.
The thing about cocktails is that they all end up coming down to some basic building blocks with variations.
One of my favourites is the Negroni, which as mentioned above has a traditional recipe of 1:1:1 Gin:Campari:Red Vermouth. If you think of this as "base" (liquor), "bitter" (liqueur), "sweet" (sweetener or vermouth or similar things), you can build a whole slew of classic cocktails.
Recipes usually adjust proportions, but basically by adjusting one or more things from the Negroni you get a whole spectrum of "classic" cocktails:
For example:
Rye or bourbon whiskey, Campari, Vermouth = Boulevardier
Whiskey, Bitters, Vermouth = Manhattan
I love swapping the Gin for Rum (Jamaican Negroni), Mezcal (Mexigroni - there's probably a more widely used name), the sweet vermouth for dry (or a mix) or Averna (Black Negroni), and the Campari for any liqueur that I feel like (usually Gran Classico).
Favourite Negroni: 1.5 Gin (often Death's Door, but there are many good ones), 1 Gran Classico, 1 Carpano Antica sweet vermouth. This is so much more complex and flavorful than regular versions, especially with any typically found vermouth, which has usually gone bad unrefrigerated behind the bar.