If you go the heavy melee route, you can slot in Equilibrium and Synth Fiber on your pet to always pick up health so you can always get that energy, and then you’ll never have energy issues.

Using the pounces for kills actually doesn’t trigger her 3 at all (which is problematic and I wish it was otherwise) so you have to do the normal energy economy stuff like Arcane Energize, yellow archon shards, Streamline, Zenurik, etc… The pounce build basically completely ignores her 3 and subsumes over it. You could even use Citrine’s subsume which would let her get energy on kills again, but I prefer Roar because I have Arcane Energize.

Basically, don’t worry about headshots and either ignore the ability or use Equilibrium to make the ability into something Voruna wants.