As @worm1 mentioned, the PG/VG ratio can affect the end result.
Too high of VG and flavors become weak (VG doesn't carry flavor well).
It could also be your pallette, as @SignMan was mentioning. Some flavors come through better for some where others barely taste anything at all.
Many variables can also affect flavor, i.e., air flow of the RDA/tank, temp/wattage of mod, wicking materials used, high percentages of flavoring (can cause muting).
Don't give up.
It's just a matter of constant learning, with the benefit of learning our own pallette and favorites along the way.
I'm sure you'll hit upon the "one".
I see you have a few strawberry flavors. Try layering them for a full strawberry taste (layering in this case is using one main flavor, strawberry, and using various makers, tpa, fa, etc., to make a more "fuller" flavor overall. Start by tasting each individually, so you will know what each has to offer overall.)
Here is a shortcut method I used to use for getting to know a flavor quickly. It works well with the syringe method.
1. Measure 10 ml of water (yup, you're gonna use water for this. DON'T put in your gear.)
2. Mix the flavor you're evaluating @1% (0.1ml) with the water. Stir well.
3. Take a sip of the, now, flavored water, don't swallow. Let it rest on the tongue, ensure it covers all areas of your tongue (different senses of taste, sweet, sour, bitter, salty, are located on different areas of the tongue. *note, sour flavors do not carry over well in vaping, they require a carrier to reach your senses (sucralose))
4. If the flavor was weak, increase by 1%, retest. Continue until you're comfortable with the % and your knowledge of the initial flavor.
Take notes! Always keep notes.
This will only account for the initial flavor, not the "magic" that happens while steeping. Some flavors fade during a steep, others become less harsh and yet others will blossom.
Sorry for the long windedness.
Wishing you the best with your next mix.