You didn't specify the atomizer, but some bring out the flavor and others are bland. Kanger T3 is good. SmokTech cartos are tasty. There are as many ways to boost taste by trying something new as their are opinions about atomizers.
Are you getting burnt sensations, dry tasteless vapor, or just not what you expected from a juice? It could be as easy as changing resistance or boosting the voltage. Let us know what hardware you have and we can go from there.
You did try a new coil, didn't you? And, if you are still smoking while vaping, taste will be elusive and variable. As Jim said, dry mouth occurs with PG based juice. Drink lots of water.