The Rebbe encourages continued outreach despite modest results, citing the assurance that no effort is wasted. He advises sensitivity when urging mitzvah observance, especially beyond basic standards, and offers guidance based on Torah principles. He blesses the recipients in preparation for Shavuot during this spiritually ascending time of Sefirah
https://www.torahrecordings.com/rebbe/igroskodesh/015/009/5424