It is not permissible to stop the Waqf that you mentioned. In fact, it should be kept according to the general meaning understood in Allah's Saying,
Then whoever changes the bequest after hearing it, the sin shall be on those who make the change.
The revenue of the Waqf must be spent on the poor and needy as specified by the person who made the Waqf. There are still many poor people but you need to look for them. If the crop of the Waqf is maize and it is not eaten in the village where you live, you may sell it and spend its price on the poor and needy people which will serve the purpose specified by the endower; that is helping the poor. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.