Rabbi Leuchter Shlita published a booklet on the subject of Avoda in the days of Elul (in Hebrew).
The cost of the booklet is $ 2 . You can pay here by Pal Pal.
And then you can download the booklet in the attached link.
Why Sinas Chinom is a reason for Churban HaBayis?
What is Sinas Chinom?
In this Vaad a new topic opens:
Which Emuna is needed for us for the world we live in will be a world that educates us to Avoda?