I cannot make anymore bids.

Do you mean bids with this seller, or bids on anything?

It's unlikely that eBay would have restricted you for retracting bids for one item, especially as you have made no previous bid retractions in the last 12 months. They would have informed you if they had.

It's almost certain to be the seller who has blocked you from bidding on their items, as they are entitled to.