This depends on how the case was dismissed. If the case was dismissed “with prejudice,” then the case is over and you cannot refile it. If the case was dismissed “without prejudice,” the court did not consider the merits of the claim, and you can file the claim again.
There may also be a question whether the statute of limitations has expired, which can be a complicated issue. If you do not know whether the statute of limitations has expired, or if you do not understand how a statute of limitations works, you should talk to an attorney.
