(1) sign up for Google Workspace subscription and then log a support ticket saying you want to migrate your old account to Workspace
(2) hire a lawyer and get them to write a letter to Google asking nicely. If that doesn’t work, you could have the lawyer escalate to threatening a lawsuit, filing a lawsuit, subpoenaing the account contents, asking for a court order that Google give you access to the account, etc - even if it turns out the law is on Google’s side not yours, they may decide to fold just to make the issue go away
(3) contact a journalist. Since you are a former prisoner, you’d need to find one with appropriate sympathies (pro-criminal justice reform, etc). If they make enough bad PR for Google, they may give you back your account in response. Probably depends also on what your conviction was, since some offenders the public finds it easier to sympathise with than others
None of those methods is guaranteed to work, but they all have potential. It really depends on how much you want that account back, and how much time and money are you willing to spend on it