Salaamun alaikum Shaykh. Hope you are doing well.
I'm looking for some advice on the topic of leading congregational prayers. I'd like to know some points that a prayer leader should be aware of, and remind himself frequently, mainly from an akhlaqi / ethical point of view. Thanks.
Fi amanillah.

Walaikumussalam brother
Alhumdulillah doing well
I hope that you are keeping well
Yes you are right there are the conditions for the one who can lead the prayers in tauzeehul masayel and other books and no doubt akhlaqiyat and good behaviours are also condition which called adalat.
Aadil means the ind who performs wajibaat and refrains from Haram or forbidden act.
Imam Ali as he said in Nahjul Balagha it message for every leader