Three main options.
1. Make an [ANN] Thread. This is a must.
2. Start a signature campaign. The budget for one of these is usually minimum 0.1 BTC a week, or $60. I assure you you will get alot of visibility.
3. Advertise for an official ad slot. Slots can go for 0.1 up to 1 btc and more.
Thanks.
How do I make an [ANN] thread? Is that for free?
Yes it is for free. Everyone can do it. Just examine the previous ann threads and you will see how it works.
If you want advertisement you came to the right place. This forum is a perfect place for this kind of business. Good luck.