How to attract direct advertisers for any site? Without involving any third party metrics.
Hire a Virtual Assistant.
Attracting advertisers isn't an easy thing to do. You must have plenty of unique visitors of that otherwise you will not earn much. Try sites like Buysellads first before start selling direct ads.
You have to be huge in your niche to get direct advertisers. Atleast 50k uv's per month. So, you better hire a third party or a virtual assistance.