There's a lot of different ways to go!
Some people will recommend a "mechanical" and building your own
coils...
Personally, I think since you asked for a STEP up, I'd suggest getting something like the
Innokin MVP2 or the newer and even smaller eLeaf iStick. These are both small box-shaped devices, with a battery you charge with a USB wire (I'd go into a wall outlet, not a 'puter).
They're cute, they have a bunch of features to improve your vape - like setting the watts (and it then adjusts the voltage depending on your topper).
The other part is "what holds your liquid" - and you may find even more improvement there.
What have you been using on the Egos?
Something like an Aerotank or Nautilus may be a step up too. Or if you already have that - it's fit on your new MVP or iStick just fine.