I have been associated with ISC since quite a few years. From my understanding, 'no restriction' on a member is permanent in IndiaStudyChannel.
However, the restrictions (if any) will not be removed automatically, all of a sudden. You will have to prove your validity by regular, original and quality contributions in other sections, such as Forum, Resource or another section. It is not hard to do, if done with love.
Also, it may be possible that it may be a bug or temporary technical issue that is preventing you to submit any Expert answers. While the 'Opinion About' category is fine to ask Expert opinions, I recommend to always post your IndiaStudyChannel related questions, problems or suggestions in Forum section under 'About IndiaStudyChannel' category, in a suitable subcategory.
To confirm if you are banned and also to request the editors to remove the ban, you can submit a request in 'About India StudyChannel >> Requests' category in Forum.
Hope it helps you.