If those 4 flavorings are the only ones you have so far...and you're trying to make a recipe with them, I'm afraid you're probably out of luck. You have 3 primary flavorings and 1 secondary, or blender. You need other secondary or blending flavorings, like some of these: Sweet Cream, Bavarian Cream, Marshmallow, Whipped Cream, Banana Cream, Vanilla Custard, Vanilla Swirl, etc., and some sweetening flavorings, too. Most recipes call for 1 or both of some common ones...like TFA Sweetener and/or TFA Cotton Candy. They're called by names that will vary from 1 manufacturer to another. For example, I think the CAP version of TFA Sweetener is called SuperSweet, and it's much sweeter than the TFA.
A simple 3 flavoring recipe that a bunch of my friends like is a version of a NannerBerry eliquid I make for them:
TFA Strawberry Ripe - 9%
TFA Banana Cream - 6%
TFA Cotton Candy - 2%
You could use your CAP Strawberries & Cream instead though, IMO. And the other 2 TFA flavorings above don't have to be TFA, if you'd rather get CAP. Might need to adjust the % for each one though, as how strong they are does tend to be alittle different from 1 maker to another.
Or...try first what dannyv45 recommended above. Lots of new DIY do some mixes with their One Shot Flavors and/or One Shot Blends first...to get the hang of DIY.