Executor delaying estate closure indefinitely

Location: Poland/USA

Briefly: Nine years ago, a family member passed away, leaving, among other assets, a house in New Jersey where they had lived. I was named as a beneficiary of part of this house. The executor of the will, with whom I have a personal conflict, sold the house only after six years, and now nearly three years since then has not distributed the proceeds to the beneficiaries (myself and his son, who lives in the U.S.).

I am not a U.S. citizen and do not reside in the country, which — I suspect — makes the executor feel untouchable. Recently, he sent me an informal accounting in which he allocates one-third of the sale proceeds to himself for alleged “expenses” that he has not documented in any way. He has also failed to provide any evidence that income taxes were paid on rent from a tenant who had occupied the house for all those years before the sale. If I’ll sign those documents I’m also wavering all my claims and take all responsibility for any debts that can occur in future.

I have tried contacting law many firms, but most are either not interested or say that nothing can be done. I have been told that I cannot force the executor to officially close the estate, and that a court case would cost me more than the value of my share of the inheritance. Lawyers also warn that the process could take many months of expensive billable hours.

Is U.S. law really so unfavorable to a beneficiary in my situation? Is there truly nothing I can do?