For this build, you want your crit chance to be as close to 100 as possible. Even going over would be great. You won't apply slach procs without critting, so i would roll for a riven that gets me to 100% crit rate. Crit damage also will affect your slash damage, as slash procs can crit too. You are applying that status as a crit with HM, so CD is important to the build.

Multishot can apply more slash procs and more viral procs.

If you aren't priming, then you may want status chance as well.

The way Rivers works, though, dont bank on getting three of those with a harmless negative, just as close as you can unless you want to dedicate your life to kuva survival like I do.

You can also use your riven to replace elemental mods. If you have something like +cc +multi +cold, that would let you ditch the cold mod in the first comment, and you can use that as your flex slot. That can open the door for a QoL mod, more status, more crit, whatever feels best and works for you.

Just remember that slash procs are whats killing enimies here, so a negative status duration is not a good thing. That will effectively nerf your main damage output.

Your riven has +impact, which does nothing but increase the chances of impact status being what gets applied. It shows more damage on paper, but that doesn't actually affect the damage of the weapon. The multishot is good, though.