I thought that was normal because some of my coins also could not be sold. Even though it's been almost 4 to 5 months and I think you have to be patient. But if you are in doubt, you can check by reading the project roadmap. And you also have to find project information through social media accounts. But if all are no longer active, chances are the project is cheating.
It's always best to avoid projects like this at first. I don't know why it's going to be taking you up to five months without being able to sell your tokens, seems like it is a scam. If the project is over their social accounts are not active and they are also not giving any reply to your questions, then it is a major scam and they have just cheated you guys and made away with it. The only thing that pisses me off is that there is no way to deal with these guys. Lots of them will cheat people and escape from being punished, because there is no way to tell who they are.