Just how far down the rabbit hole do you want to go and at what price point? Easy way is to switch juice. Switching to a dual coil tank is another. But, those have their maximum, as well as your MVP has it's limits as well.
There is a general path to getting thicker clouds. More power to the coils, multiple coils with a good juice. You've probably heard the term "mech mods" thrown about. those are Personal Vaporizers (PVs) that provide practically a direct link to the battery. That offers almost the full power of the battery to your coils. The MVP has a limit of 3 amps. That can be a good thing when you take safety into consideration. However, when you need more power to run two, or four coils, the MVP just won't be able to pull that off. With the MVP's 3amp limit, you'll just have to see which is better, a good single coil build, or two smaller dual coils...
As far as the better juice, E-juice is made primarily with four ingredients. Propylene Glycol (PG), Vegetable Glycerine (vg) Flavoring, and Niccotine.
Propylene Glycol is one of the best carriers of flavor. It is the consistency of water. A higher Propylene Glycol content will carry the flavor better, and have a stronger "throat hit" (the burn at the back of the throat). It also produced some vapor as well.
Vegetable Glycerine is also a carrier of flavor, but it doesn't do it as well as Propylene Glycol. It is thicker, and has the consistency of vegetable oil. It does, however, produce a greater cloud of vapor than the PG.
So, if you had a higher VG content, you will produce more clouds... albeit at the loss of some flavor and throat hit. if it had more PG, it would produce more flavor, and have more of a throat hit, but not produce as much vapor. the choice is yours.
With that said, you need to consider the thickness of the juice as a factor as well if you're doing a tank system. The thicker the juice, the slower it will wick. If you don't have a good ammount of liquid to atomize, you won't get as much vapor. Too liquidy, and you can flood the coils and they won't get hot enough to vaporize as well. So, you need to find a tank, and then find the ratio that works best for that tank.
An easy way to get more vapor is not an easy answer. It's more of a trial and error until you get what you like. If you want enough vapor it practically creates a lightning storm, do research on mechanical mods. And yes, I recommend doing TONNES of research before even considering that route, since there are some dangers as well.