Explosive knife should probably be reverted to its previous damage balance. Lightweight knife didn't really see an increase in use after it got buffed and Eknife got nerfed and it made explosive knife feel worse in pve, it in particular made calibans feel worse due to the explosion being far less likely to kill an ad
Flux grenade should also probably be reverted to its magnetic grenade style of functionality or another rework, it was an interesting experiment in cooldown/ease of use vs potency but I've not seen it used unironically in almost any context since its rework. And it doesn't really have an exotic to make it more palatable in pve.
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What about Gambit ?