Shag haircut growing out...

I have a shag haircut where the longest part is slightly above shoulder length. The top layer has grown out so that now it's to my ears, and it just doesn't lay as nicely anymore. It's been a few months since I got it cut - August, I believe - but I just trimmed the bottom length the other day. Is there anything I can do to make it look nicer, or do I need to just get it cut again with the razor by the hairstylist? I normally let it air dry, so would drying it with a round brush help at all? It normally helps the fringe at the front.

I don't want to grow it out, I Just don't want to head over for another haircut quite yet if I don't have to.