In the past I would also try to reinforce that ST don't have to be "dangerous" simply by showing up.
As a ST on Shadowrun: Seattle, I would pop by as various contacts, even family, of a player just to RP with. For instance, one player had in their sheet they had a family member deeply in debt, I'd call once in a while and RP as that family member asking to borrow some money. Or, simply describe additional mundane things going on, or show people discussing fallout from another player's story.
Trying to keep things organic. But this is beside the point of plot and player plots, ultimately, I just see more Player Plots than Plots because I find ST's increasingly worried about ticking off people, or again, Staff not even interested in hiring ST's.