I'm cautious about increasing volume generally as my tendency is to overdo things and then realize my mistake afterwards. Arms are less of a concern for overtraining than legs though (it's just not as draining). Watch your form, as exhaustion leads to sloppiness, and that's where injuries tend to come in.
Thank you for the hints. I am just 1 year into strength training so, advices from more experienced trainees are welcome. I am looking for breaking plateau and noticed I never feel like I trained the day before. Let see what happen!
You can increase volume relatively safely through a variety of programs, but definitely don't just start doing more sets/reps willy nilly. Upper body also tends to recover more quickly than lower body, and you can usually get away with more volume on benching/pressing. That said, as you get stronger at bench, be careful with OH press, as you can blow out a shoulder. Periodization is one example of programming that can bust plateaus, although that is a complicated subject I barely understand myself beyond a surface level.
A more straightforward approach is to use rated perceived exertion (RPE for short. Basically, rate how difficult the set was on a scale of 1-10) and work up to a top set (~9-9.5 RPE) with backoffs for each movement, alternating main movements with accessories. I am on a high volume program myself right now and I love it. Took a couple weeks for my body to adjust, but I am making a lot of progress at what I would say is a high intermediate level at this point (powerlifting: 235 bench, 405 squat, 545 deadlift). Here is a generalized version of my current 8 week program, after which I am pretty confident I will put 10-30 pounds on each lift based on how things are going:
Day 1
Max effort squat (2-5 reps, varying each week) to a 9-9.5/10 RPE
-5% backoffs from top set weight, as many sets as I can until I reach a 9-9.5 again. I put a hard stop at 20 minutes if I'm not fatigued enough by then.
Accessory deadlift (e.g. deficit, paused, etc.) 5-10 reps
-10% backoffs from top set, same scheme as above
1 or 2 dumbell accessory movements (e.g. split squats & rows)
Day 2
Max effort bench, similar to above
Accessory bench 1 (e.g. close grip)
Accessory bench 2 (e.g. wide grip)
Tricep accessories (3-4 sets of 12-15)
Day 3
Accessory squat (e.g. safety squat bar, paused high bar, etc.)
-10% backoffs
Max effort deadlift
-5% backoffs
DB accessories (e.g. rows)
Day 4
Accessory bench (right now I'm using a duffalo/buffalo bar cycling between legs up wide grip, close grip, and regular wide grip)
-10% backoffs
Alternating weeks DB overhead press and flat DB press (8-10 reps @9-9.5 RPE. Backoffs at the same weight, but lifting to failure each set)
Various upper body accessories
I really like this approach. Tons of volume but all feel based so once your body adapts there is no real danger of injury as long as you are disciplined and have good form. Burnout might eventually be a problem, but hopefully not for a while as long as I deload/eat/sleep properly.