Hi Jackie. I've only been
vaping for about a month, so I'm far from an expert, but have you tried tightening or replacing your atomizer coil? I have a Kanger mT3
tank and after about five days, I noticed that it was not working like it had in the beginning. Still I kept sucking on it (harder and harder), trying to get a better hit. Turned out that I needed to replace the coil (the little head at the bottom of my tank). I also found, once, that my coil head had worked itself loose (how did that happen?). Simply tightening it solved that problem. What a difference that made! I don't know if your tank is similar to mine, but hopefully this helps.
Also, sometimes you will see a few tiny bits of liquid on the battery--I just make it a habit of using a tissue to wipe off/soak off this liquid whenever I'm changing the battery or the tank. I don't know if it impacts vapor production or not, but I'm of the opinion that liquid doesn't mix well with electronics, so...
One last thing, does you VP gurgle when you draw on it?