Sometimes you have to stand alone, and not become bitter that others have fled, but you just have to do what needs to be done, and the Lord will see what you have done, as happened with Eleazar, one of the mighty men of David,

And after him was Eleazar the son of Dodo, the Ahohite, one of the three mighty men with David when they defied the Philistines who were gathered there for battle, and the men of Israel had retreated. He arose and attacked the Philistines until his hand was weary, and his hand stuck to the sword. The Lord brought about a great victory that day; and the people returned after him only to plunder (2 Samuel 23:9–10).

Therefore, do not complain when others have decided not to do the work, but do what you can. May the Lord be with you.