I'd suggest doing creative content for bounties that you actually believe in.

Most bounty hunters go for the easy bounties, like twitter or facebook. Doing an ICO Review would put you in a lower reward pool, yes, but it also has fewer people participating due to the difficulty and time requirement, so, you actually yield quite a bit more than typical social media bounties.

Other than that, spam your referral codes on your channel and in the description of the videos you're looking to monetize. You may need to provide additional channel content to drive viewers to your channel, but once they're there, depending on the quality of your CC and your engagement with the ICO, they're more likely to click your refs.

The biggest thing I can suggest if you decide to do the creative content route is absolutely pick ICOs that you believe in. I have seen many ICO "review" videos that simply show a user scrolling through the website with music in the background. This is the worst type of "review" video there is. There are many lazy people who try to attempt this, but it neither helps the creator as much as it could for the time investment, but it has a negligible impact for the ICO as well. This is because they're doing every bounty they possibly can instead of focusing on the projects they love. When I see people who promote ICOs and actually get excited, I'm much more likely to listen to what they have to say.

Anyway, I hope I helped! Personally, I've been looking for a solid crypto youtuber to promote on my twitter with the bounties I have participated in. This is why I suggest sound ICO review videos, because a lot of the bounties I participate in require at least 1-2 regular tweets about their project. To create original tweets(as opposed to retweets) I often use other people's content to cross promote. If you had a video on an ICO for the bounty I'm also participating in, chances are I'd tweet the video and increase your viewership. Something to consider, as I don't think I'm the only person who promotes other people's content.

Also- as a heads up, people around here generally don't like to talk about twitter/facebook/youtube monetization because of the relationship with bounties and spammers, so don't be surprised if you get someone in here saying 'This is btt, not youtube help,' which is possibly a big reason you weren't able to find any recent threads about this topic.