Improve suggest edits
The implementation of the request Tell users when edits have been rejected simply does not work.
Please just add a regular notification, as you already do with approved edits! As to why it does not work, I have pointed that out in the comments to the official answer and here. I aleady made a feature request in MSO.
There are tons of ideas floating around to free up the suggest-edit queue. Please just implement any of them like For edit-suggestors with a streak of N approvals, only require one approval for their next suggested edit, Opining a successful-edit-count-based two tier suggested edit system