Word of mouth is cheap and, in my experience, not very effective for the amount of work usually involved. The reason being that most people surrounding me aren't interested in blockchain, crypto or making small amounts of money from social media posts. The most effective form of marketing I have at this moment is targeted advertising through social media. You know those pesky ads that seem to have been listening to your every word and thought? FB and IG utilizing your data finally benefits you if you know this. the minimum adspend is $1 per day. I run ads for services that have a $30 minimum so if even one person hires me then I will have paid for my entire months adspend. I've tried encouraging different projects to utilize this information over the years, but we haven't been able to come up with anything directly profitable to market as of yet.