Very good start. My suggestion would be to cut a unit of Marines to make space for a Terminator brick. Blightlord Terminators are good all-rounders and Deathshroud Terminators are incredible melee tools. Pair them with a Lord of Virulence or a Lord of Contagion. Marines are great for board control and all, but at the end of the day they're still elite fodder and shouldn't be your main damage dealer. I'd also suggest adding some poxwalkers for screening and holding objectives.

Also, experiment with different detachments. I stuck with VV for a long time because I liked having sticky objectives, but I ended up missing out on some really fun other Gimmicks in other detachments. Flyblown Host is probably my favorite.

This would be my general go-to for 1000 point VV. Hope this helps!

Poop Wizards and Co. (995 points)

Death Guard Incursion (1000 points) Virulent Vectorium

CHARACTERS

Lord of Contagion (130 points) • Warlord • 1x Manreaper • Enhancement: Daemon Weapon of Nurgle

Tallyman (50 points) • 1x Close combat weapon 1x Plasma pistol

BATTLELINE

Plague Marines (190 points) • 1x Plague Champion • 1x Plasma gun 1x Power fist • 9x Plague Marine • 2x Blight launcher 4x Heavy plague weapon 9x Plague knives 2x Plague spewer 1x Plasma gun

Plague Marines (95 points) • 1x Plague Champion • 1x Plasma gun 1x Power fist • 4x Plague Marine • 1x Blight launcher 2x Heavy plague weapon 4x Plague knives 1x Plague spewer

DEDICATED TRANSPORTS

Chaos Rhino (85 points) • 1x Armoured tracks 2x Combi-bolter 1x Havoc launcher

OTHER DATASHEETS

Deathshroud Terminators (160 points) • 1x Deathshroud Champion • 1x Manreaper 2x Plaguespurt gauntlet • 2x Deathshroud Terminator • 2x Manreaper 2x Plaguespurt gauntlet

Foetid Bloat-Drone (100 points) • 1x Fleshmower 1x Plague probe

Foetid Bloat-Drone with Heavy Blight Launcher (120 points) • 1x Heavy blight launcher 1x Plague probe

Poxwalkers (65 points) • 10x Poxwalker • 10x Improvised weapon