The Rebbe advises that exaggerated focus on confusing thoughts is itself a tactic of the yetzer hara. Instead of fighting them directly, one should redirect the mind to Torah and mitzvot, where light dispels darkness. Practical advice includes Torah study, giving tzedakah before weekday morning prayers, and participation in communal activities.
https://www.torahrecordings.com/rebbe/igroskodesh/015/008/5400