If you're growing 25% / month, you're not doing too badly.
How well are online ads and referral working? How does the referral program work?
It sounds like there are a bunch of channels you haven't tried yet. Here are a few ideas.
Standard channels:
1) Sales. Yes, you call up the all the salons and ask them if they need Growthzilla. This is still the way most things are sold to local businesses like salons. You can try email, phone, even in person.
2) Content marketing. My guess is that there are a lot of salons, and not a whole lot people writing about how to run them. Maybe you can become the go-to place not just for software, but for the knowledge salon owners need to run their business well.
3) Improve your website. It looks like there's no way to just try the software, and there isn't much info about it on the site. Having something other than "request demo" may improve conversions.
Wackier ideas:
1) There are lots of software options for salons that do something similar. It's not clear from your site what makes you unique. What is it? If there's nothing truly special, maybe you need to change the product.
2) Channel partnerships. Who are the big companies selling products to hair salons? Could you get them to resell Growthzilla and split the revenue?
3) Affiliate sales. Are there affiliate sales people who sell other products to salons (scissors, hair product, etc)? If so, can you have them sell Growthzilla too?
4) Organize free conferences / meetups for salon owners to learn about how they can tech-enable their business.