Tips to grow my waxing business ?

Hi guys! I’m new here! I currently own a waxing salon and i feel stuck. To everyone else it seems like I’m doing well but I feel like I’ve exhausted all the education I have currently. I average about 30-40 clients a month but I want to do more. Any marketing tips? It’s also coming up on my slow season so I think I have “slow season blues”. What are some things I can offer to keep my books up? Thank you in advance!