Jenos can 1v1 weaker enemies very well, he can pump out some decent damage and then use his Void Grip to allow his teammates to gank you. If you are able to, try to continually shoulder peak him so that he can't Void Grip you, or take a teammate.
If your Sticky Bomb is stuck on Seris and she uses Shadow Travel, the Sticky Bomb stuck on her will still be visible. You can track her down that way, but you won't be able to attack, unless you decide to detonate your "tracking device".