If your PR is ready for review, consider testing the new bot Marvin. You can opt-in your PR and indicate that you’re looking for a reviewer by posting a comment with the commands
/marvin opt-in
/status needs_reviewer
The bot will then set the appropriate status label. It will also attempt to assign you a reviewer, though review capacity is limited. If it does not assign you a reviewer right away, please be a bit patient. The bot will assign reviewers to older PRs first, your PR will get its turn eventually. Once it has been reviewed, it will be brought to the attention of someone who can merge it.
If your PR is managed by marvin and gets stuck waiting for a review, that is considered a bug. You can only opt-in your own PRs.