I won't go into all of it, but one thing that has really helped is to have all the tasks in progress on a board where everyone can see them.
And only have one task in express lane and two non-express items at any time.
You haven't said whether the problem is too much work or competing priorities (or both). Whatever it is, this has helped me.
When the teams I worked with switched to kanban, they liked that they didn't have the end of scrum deadline, they also disliked that they didn't have the ten day deadline anymore as they felt the arbitrary deadline helped to push them a little.
That being said, kanban is better, it is more relaxed and feature feedback is faster than scrum.
Boiling frog syndrome in a way(1)
Not having to decide priorities is a massive relief; the product owners know they have to discuss priorities with each other and my team leader, not me.
(1) yeah I know it's not an accurate analogy.