I'm going to suggest what I usually do here. If you're happy with what you have, then get good with it first before spending more money on something else. buy some blank cartos and grab some different flavors of liquid to try out. There are plenty of videos showing you how to fill them. Buy a clearo or two to try out until you find what you like.
Upgrade if you want, but don't do it until you're comfortable with moving away from what you have. There are many people who have been vaping longer than most of us in the New members section who have tried every type of PV out there and have gone right back to the small batteries because that's what works best for them. Spend a month or two getting comfortable with what you have before spending good money on something that may end up frustrating you even more.
Upgrade if you want, but don't do it until you're comfortable with moving away from what you have. There are many people who have been vaping longer than most of us in the New members section who have tried every type of PV out there and have gone right back to the small batteries because that's what works best for them. Spend a month or two getting comfortable with what you have before spending good money on something that may end up frustrating you even more.