Strength / Weight Training

mid and lower trap exercises!

Way to specific... If you must, facepull but must be angled slightly 10.37% downwards (jk- matching like with like)

Try these - https://www.menshealth.com/fitness/a19545889/best-traps-exercises/

13 Best Trap Exercises
Trap Bar Shrug
Cable Shrug
Dumbbell Shrug
Kirk Shrug
Overhead Barbell Carry
Farmer’s Carry
Dumbbell Row
Trap Bar Deadlift
Rack Pull
Dumbbell Prone Y-Raise
EZ-Bar Upright Row
Rope Pull Apart
Dumbbell Lateral Raise

But as you can see, it's basically made up of shrugs, carries, raises or rows.

My advice, go heavy. They're very strong and tend to hang back (intensional) for other bigger groups.