Saving Jewish Souls From Gehinnom

Is saving Jewish Souls From Gehinnom possible? Rabbi Yaron Reuven says in the name of Rabbi Yehuda Fetaya that saying kaddish could potentially bring someone out of Gehinnom. For most people it will take much more than that, like doing many mitzvot and helping others do TeShuva in their merit to bring them out of Gehinnom, but it is possible. And the best thing is by doing so, it saves more Jewish souls from going to Gehinnom in the first place and earns an abundance of eternal merits.