App stuck in "Waiting for Review" for over 10 days

Title: App stuck in "Waiting for Review" for over 10 days

I submitted my app for review over 10 days ago, and its status is still "Waiting for Review." Apple states that 90% of reviews are completed within 48 hours, so this seems unusually long.

I've contacted Apple Developer Support twice without receiving a response.

Is there anything else I should be doing, or is there a way to have someone investigate or escalate the issue?

Update: I requested an expited review a few days ago. The app is still stuck and review and I have not received a response from support. Are there any other things I can try?