It's possible the wattage is too high for your juices/coil. If you have any device (or any person who could "taste test" flavors in your tank for you), that could mean that you need something with lower wattage, or higher resistance coils, if your wattage is fixed, although I briefly took a look at the product page, I'm unclear whether it naturally reduces in wattage or remains fixed at one wattage? Having someone taste your juices might rule out vapers tongue as well (I'd have them taste it on your device and if they find flavor, this might point more to vaper's tongue...)
I'm also not clear if you've gotten "no" taste from the beginning, or it has suddenly dropped off. If it's the former, it's more likely to be your setup in some way (or, those juices are just not right for you) if it has happened more suddenly, well, you're in the right time period for vaper's tongue, honestly. There are lots of remedies for that (biotene, more water, lemon zest to "wake your tastebuds up, sniffing coffee grounds or sucking on a coffee bean, tongue scraper, the list goes on) but mainly it's time. I had it myself for a few days. If it is vaper's tongue the main thing to do is have patience, and also sometimes vaping unflavored is a good idea, as without the "expectation" of flavoring the frustration is less.
Good luck and I do hope you get it figured out.
Anna