The easiest and the most affordable way to promote your business is to collaborate with other businesses.
The main thing is you approach business that complement your business so eg if you’re a hairdresser approach a business that sells hair product.
You can review their products by doing a vlog (video blog) or write an article/ blog they can put on their site or social media.
You give them content and in return you get exposure.
This is one example but there are many other options like promoting their products or services to your audience. It gives you a wider range of things to offer your audience and maybe negotiate a % of the sale?
There’s no harm in approaching a business and asking if they’re interested in a collaboration?
I am always interested in collaboratin!