You can try this if you want or not,up to you
About two months ago I started hitting Tricep pulldowns everyday three days straight after EVERY set of another body part for 20 reps at a hard enough weight where you can get 20 but ya shyt be burnin by the time you get there and on the other three days I did biceps the same way,swear I put about a good inch on my arms,thats about 500+ reps a day,ya arm aint gon have no choice but to grow as long as you not doin no p*ssy weight or weight that aint makin you go hard.
Dont listen to that shyt about overtraining breh long as you sleep enough and eat enough you a be good, try my method and see if ya arms dont grow.