Have you tried testing your flavors individually first?some of them may make excellent stand alone flavors!
I mix up 5-10 ml bottles of every flavor (I buy these tiny plastic bottles in bulk on Amazon, 10ml is a better option, in my opinion) then test it on it’s own. I like to also to do some in-tank combinations with those mixed flavors to see how they work together. I can also loosely try a recipe this way, to see if I like the flavor combination. I don’t really sample additives much, but I have them mixed simply for testing how it changes flavors by combining them in tank.
As for buying more, it really depends on what flavor profile you want. Fruit, dessert, tobacco, cereal, candy, etc…
I am a fan of RY4, specifically TFA RY4 Double. It is a tobacco blend, but not overly tobacco tasting. It’s mixed with caramel. I like it in the recipe Candybeca which you can find on the recipe side. It is my favorite recipe that I have found and ADV.
Purilum Tropical Blend is an amazing stand alone that tastes like a mixed recipe of tropical fruits. (Available at nicotine river)
But everyone has different preferences!
You can search for a recipe of something you would hypothetically like to vape and see what comes up. For example, I searched Orange Julius and it was there! Mixed it, love it!
I like to sort search results in order by ratings. And order the flavors I need for a recipe I decide to try. I add that recipe to my favorites so I can find it again, and hit the option to add missing flavors to my shopping list (which also adds a link back to the recipe you want it for, which is helpful).
You can go to the entire list of recipes by hitting e-liquid-recipes home at the top, and sort by ratings to see the most popular options.
You can also search for recipes using “search by flavor” your stash comes up, click one or 2 you would like to use together, and see what recipes contain those flavors.
If you haven’t done so before, click on a flavor name and read what people’s notes say about it, suggested usage % alone and in recipes, and a list of recipes with that flavor is available near the bottom.
I hope this helps give you some places to start!