Running an advertising campaign on Facebook and Google can help a lot. They are holding a great amount of customer's insight in which you can use and make a suitable target. The signature campaign is also a great choice for sponsors cause the bitcointalk community is a place where most of the crypto traders come to visit. News and articles are also very good but you need to have the right source with a high volume of traffic daily. I suggest you can make an offer with Coindesk. Many traders read this site for new information