Pick 2 exercises. Train each exercise once per week.
so that’s hitting biceps 2xper week.
do 3 sets all to failure. 6-9,10-12,15-20
add weight or reps each week. If you fail to add weight reps change the exercise. Continue ad nauseam.
I think more volume is hardly ever the answer.
Progressive over load, intensity, frequency, and recovery.
If your Db curl for example goes from 20lbs for 6 reps to 50lbs for 9reps then they will grow.