There are lots of options, if you enjoy MTL
vaping (higher resistance, less vape) you can probably find something more powerful that will give you a better vape fairly easily. The Aspire Zelos kit which comes with a nautilus 2 is a good place for many folks. A lot of people like Pico kits and they usually come with a Melo II or Melo III tank (the later being airier vape) but the Melo
tanks can accept several different coils, so many folks like them. If you want another pen style vape, there is the T18 or T22 kit, which many people love the vape from that tank. A disadvantage is that it is not variable wattage, it is fixed, though often low enough that people really enjoy the vape, some people swear by them.
If you are looking for something more elaborate or with removable batteries there are also many options, but it would probably help if you can say more about what you like and dislike about the Ego AIO that you are using, and if you are looking for MUCH more vape and low resistance cloud direct lung setups or something more LIKE what you have but a bit more robust.
Welcome to ECF. By the way, you may want to ask a mod to move this thread to the general
vaping questions board, as this subforum you posted in is not that busy.
Anna