I hit a similar wall around 17 lbs down and freaked out a bit, but two weeks later it started dropping again with zero changes. Side effects are the tiebreaker for me too--if you're tolerating things well, waiting another week or two costs you little.
Plateau at current dose, bump or hold?
I stalled hard around 20 lbs down on Trulicity and just stayed put, and it shook loose on its own after about a week and a half. Since you're at three weeks already I get the itch, but if your appetite control still feels decent I'd give it one more check-in before deciding.
Mine broke around 28 lbs down after nearly a month stuck, and I never touched the dose -- it just started moving again one morning like nothing happened. If your appetite suppression is still doing its job, I'd ride out another couple weeks before changing anything.
Almost at the same spot as you -- I'm down 30 and sat there for nearly a month before it started dropping again last week, no changes on my end. Only thing I'd weigh is how your appetite control feels; mine never slipped, so I was content to wait it out rather than bump.