Fear Allah, and follow His messenger.
Lut's call, same as every brother before
Before forbidding their sin, Lut calls them to worship Allah alone and obey the messenger Allah sent. Every messenger in this surah starts here. The specific wrongs are named after the heart is addressed.
You keep trying to quit a habit by willpower alone, and keep falling back. Maybe the start is not the habit. Maybe it is how present Allah is in your day.
I need to fix my behavior before I can get close to Allah.
Getting closer to Allah is what gives me the strength to fix my behavior.
Before facing a habit you struggle with today, spend two minutes in dua about it.