You have 60 days from the date of purchase to leave feedback. This has not changed in years.
Try again by clicking on your feedback rating (58). At the bottom of the page, at left, you will see a link "Leave Feedback". This will open a page listing all transactions in the last 60 days for which you have not yet left feedback.
Select the appropriate transaction and complete.
Please come back and let us know how it worked out.