This falsity around him and within him did more than anything else to poison his last days
I'm not entirely sure what you need us to do here. Do you need to write a verb that would fit the sentence? If so, do you have any options? If not, here are some verbs that would complete the sentence properly: right, undo, redress, make up for, compensate for, apologize for, etc. Hope this helps!
Listen to their viewpoint and after give feedback on your opinion (respectfully of course)
