I got the error message
Users cannot suggest edits when trying to suggest an edit to this question.
Why do I get this message?
And, more importantly: How can I make sure I can suggest edits again?
Considering that you've suggested 10 edits clearly you know that edits can be suggested to posts.
Why you're proposing a feature that not only already exists, but that you've used repeatedly is beyond me.
Note that edits cannot be suggested to locked posts, posts with another pending suggested edit, or by users that have been temporarily banned from suggesting edits.