Design hack:
Set up an hour long meeting once a week, or at least once a sprint with your dev team just to go through and fix all of the tiny UI details that could be better.
All of the things that would never get prioritized in a Sprint planning.
All of the things that maybe a user would never notice.
All of the things that might have been missed in original implementation or just don't align since they were first built.
Change colors, update icons, improve hover states, fix overflow issues, add better tooltips, make shadows better, cleaner alignments, fix typography bugs, move a pixel here, change a hex there.
No tickets.
No backlog.
No user stories.
No business justification.
Nothing that takes more than an hour (or close to it).
Just craft.
You'll love your product more. Your team will get a chance to jam with no expectations or KPIs. I thought it would be nit-picky at first, would give the impression of busywork, but my team is as motivated by it as I am. It helps clean up old code, unify implementation, and get exposure to features that they may not have worked on.
Cleaner code. Cleaner UI. Cleaner product.
Tiny improvements, huge gain.