About the limit of 5 posts per day set for your own post you can edit, there is few you can do. Not even moderators can raise that limit for users, or for a single user.
In the case your posts are radically changed by another user, and somebody notices it, the edit would be immediately reverted.
Editing a question could help if your question has been closed, and it doesn't have any answer.
In that case, after you edited the question, you can flag for moderation attention, asking to re-open your question. I am not sure if moderators would re-open your question in all the cases, but that it could help if it gets up-votes, and somebody provides an answer you accept.
In the case there are answers, it is probable that changing a question that has been closed would not help for re-opening it.
Radically changing the question would invalidate the given answers, and the moderator who would re-open your question is not going to delete the existing answers that don't have anymore meaning. This would require a moderator to evaluate which answers don't have anymore sense, and this is something moderators are not called for.
If you really need to change your questions to re-open them, you have the limit of 5 posts per day. Alternatively, users with a question ban are usually said to gain reputation by answering to questions. I cannot say if this effectively works, as I have never had a question ban.