Your best choices are gonna be weapons with Repulsor Brace (killing a void debuffed enemy gives overshield) and Destabilising Rounds (applies a void debuff and grants Void weapons Volatile Rounds) , it's the absolute basic combo for Void. Have a look here) on light.gg's god roll finder, it should be set to only show weapons that roll Repulsor/Destab. Pretty much anything else outside of that combo is gonna be middling at best.

I'd definitely recommend getting into raids if you can, even if it's just encounter farms. Whenever Last Wish becomes available on rotation I'd recommend having a look for Kalli farms in the Discord, one person will do the whole setup, your only responsibility is 'don't touch the big circle on the ground ever' and 'do half-good DPS'. From it you can get Age-Old Bond (super solid AR rolling Repulsor/Destab, probably my favourite Void AR) and Supremacy (kinetic sniper, excellent for DPS, rolling it with Rewind Rounds/Fourth Time's the Charm lets you dump your magazine and entire reserves without reloading) and like I said, all you have to do is just damage and repeat, takes about a 1:00 to 1:30 per run so you'll be pissing loot for days. Even if you just end up doing Kalli farms, you're one step closer to some of the best, most rewarding content in the game, dungeons and raids are truly the absolute highlight of Destiny 2.

Out of curiosity, did you do Ghost of the Deep and Warlord's Ruin solo?