I do not understand the question.
Not only do you not have to delete games, you should not do so without a good reason. Updating is not such a reason. https://itch.io/t/3693485/do-not-update-your-games-by-deleting-them-and-uploadin... And neither is "promotion". https://itch.io/docs/creators/quality-guidelines#avoid-uploading-reskins-or-many...
You can contact Itch in various ways. https://itch.io/support There is also a feedback button.
Contacting game developers depends on the developer. Look at your own profile to see an example. Some developers cannot be contacted directly or at all.