Hatolah, Zaka, Yad Sarah, Bikur Cholim, Va’ad HaRabanim and more.
And yes this is a place to start, Most Israelis (Maybe there are some diehards who feel different) admire Zaka and are willing to accept Zaka volounteerism as service.
As far as weaker, Many compare Yeshiva to University students (for whatever reason) and say if students can learn in University they can learn in Yeshiva. In Universities only the best of the best remain after 4-5 years, Perhaps 5% of university students remain “Permanent students”
Let the yeshivas decide that 5-10% of the learners are the best, I am sure the Roshei Yeshivas know who are the real learners and who are the Not so good learners