You have all primary or main flavorings, except for the Menthol, which is an accent. Recipes usually also include other flavorings to round them out, make the primary flavoring smoother or less harsh, to make it sweeter, etc., so the mix as a whole will taste good. You'll need some secondary flavorings (sort of the blenders and/or smoothers in a recipe). Some of the ones commonly used in recipes include: Vanilla Swirl, Whipped Cream, Vanilla Bean Ice Cream, Sweet Cream, Bavarian Cream, Marshmallow, etc. You'll probably also want some accents and/or sweeteners, as many recipes use them. A few examples of those include: Sweetener, Cotton Candy, Brown Sugar, Sweet & Tart, Sour, etc.
My suggestion would be to check out a bunch of different recipes, to see how often those are used. You'll also notice that the % for the primary ones (like yours) is used at the highest % in a recipe, followed by those that are blenders used at a lower %, and then the lowest % are the accents or sweeteners.
The Diy E-Liquid subforum is a wealth of information, and there are even discussions with recipes there, too. You might want to browse one thread that's called Recipes for Dummies, which includes many many recipes that are easy to make and don't usually require as many different flavorings as others do. Many of us browse them even though we've been DIYing for awhile already.