Exercises aside I've had some good results from something that might sound counter-intuitive. When I'm trying to put size on my arms either for show prep or beach season, I train them every other day. If you train them heavy EOD you're going to hit a wall, but if you periodize a little and keep mixing up the workouts I think you'll find it effective.
This might not work for you, but my arms need a lot of volume to stay full looking and "aesthetic." I don't do this all the time though. I'll do something like 2 weeks of training them EOD followed by a week with just some assistance work after chest or back. And get that blood in there. You don't have to train arms super heavy, but you gotta focus on the squeeze and getting a good pump.
Just stay out of the squat rack.