Voidwalker is in a weird place. It’s kind of a jack of all trades subclass but master of none. It has a pretty strong super with Nova Bomb, but not the strongest. It has cool grenades that can do some unique things like track enemies and do area of effect damage, and a melee that can steal life and feed into your grenade energy. But like the Gunslinger, it kind of lacks team synergy.
How about adding some more interesting modifiers? Perhaps steal a page from the Titans and give Nova Bomb the ability to suppress enemies that survive or create a blinding field? Perhaps Bungie can make Voidwalker the master of damage over time and have enemies that die to Vortex Grenade or Nova Bomb Vortex spread their poison to other nearby enemies. Give it something that it is better at than anyone else.
Voidwalker isn’t far off, it just needs to feel a little more besides just waiting around to blow things up with Nova Bomb which is kind of what it is right now.