Should the contract with the farm owner be rescinded due to the lack of mosques in the area, or is it permissible to return to work without embarrassment?

There is no need to annul the contract, and it is permissible to remain on the farm. As long as the work and earnings are lawful, then it is a lawful provision. Praise Allah, maintain your prayers, call the Adhan and Iqamah, and safeguard your religion. Glad tidings of goodness are coming, even if you are alone.