The phrase "were no avail" implies that something was unsuccessful, ineffective, or useless. Some antonyms for this phrase would be "were helpful," "were effective," or "were successful." These words suggest the opposite of the original phrase, indicating that something was beneficial, achieved the desired outcome, or made a positive impact. Other antonyms could include "were advantageous," "were productive," or "were fruitful," among other similar phrases. Using these antonyms can help to convey a more positive or successful tone, rather than focusing on the failure or lack of effectiveness of a particular action or effort.