Hello, to answer your question, no there are no limits. But it is very difficult to try to find well written works that should be worthwhile because first of all it requires great knowledge or competencies to evaluate them, then it is a field with a high percentage of plagiarism.
Anyway, in my post I write:

If you would like to suggest some content, yours or someone else's post, that in your opinion deserve more attention, please contact me on discord (@miti#1563).

and

Also, if you want to propose your post to my curation project, please feel free to use the tag #miticuration and I'll consider it!

so anybody can help me in my curation project.