I would probably avoid cutting it for growth. I noticed they always cut off more than just a trim. Spacing out your visits to a barbershop/hair salon is best.Yeah Ive seen it, you have the perfect combo of straight and wavy hair.
My hair reaches my almost to my neck now. Did you consider cutting yours for reegrowth?
As long as your scalp health is on point and your hair is appropriately moisturized you should be good.
My hair absorbs product very easily so build up can occur. That's why I tend to do scalp exfoliation scrubs to get rid of it. I've tried coffee scrubs, bentonite clay masks or activated charcoal masks.