What do you mean by a "blocked account"?
Your account can't have been restricted from selling because you still have items for sale.
If you're referring to another account which has been restricted, if the restriction was indefinite it's unlikely ever to be removed. In fact, it's likely to be applied to your present account too if eBay associates the two accounts.
If your bids have been blocked as a buyer, this will be because the seller or sellers have blocked you from bidding. Sellers can block bidders for any reason. Common reasons are that they don't deliver to the buyer's location, or that the buyer has received two or more unpaid items strikes within the last year (most sellers will block bidders who have).
If this doesn't answer your question, could you clarify what you meant by "blocked"?