Take a week or so off. Do some cardio, or yoga. Change your workout plan after a break to "shock the body". The reason you plateau is because your body will eventually get used to the exercise and or weight. Let it rest or change the workouts. Even changing the days of your workouts will help. For example, if one monday you did chest, do chest on a different day.
21s are a common bicep exercise and are pretty easy to do. Curls from your hip to midsection 7 times, midsection to chest 7 times, then from your hip to chest 7 times.
I forget what they are called, static curls perhaps? Where you keep one arm with a dumbell at 90 degrees while curling your other arm. Very tiring but effective.
Chinups workout the back as well.
You can always youtube these exercises if you don't understand them.
Also, various of the exercises you listed work more than one body part, which is something you should know when choosing what muscles to work out.
