The Rebbe encourages the writer not to fall into sadness or self-doubt, emphasizing that avoiding negative speech includes how one speaks about themselves. He highlights the spiritual power of the days between Pesach and Shavuot and blesses the writer with improved health and growing success in spreading Yiddishkeit and Chassidus.
https://www.torahrecordings.com/rebbe/igroskodesh/015/009/5468