You need not do anything. You are to continue to be steadfast and ensure the absolute faith in Perumal and Acharyan does not diminish. Svami Desikan as said the same. Even when one does not have absolute faith during bharanyasam, Perumal will induce that.
Do not confuse yourself with such thoughts and end up worrying. Do not seek atonements out of any fear. Ensure your absolute faith in Acharyan and Perumal does not lessen.