The Rebbe expresses pain over the decline in participation but emphasizes that every Jew is given the ability to fulfill their mission. He encourages renewed effort in spreading Yiddishkeit and Chassidus, noting the importance of using every opportunity, even in the summer months, and urges working together pleasantly to bring positive results.
https://www.torahrecordings.com/rebbe/igroskodesh/015/010/5552