Why not try out youtube for advertising, its very popular right now for crypto with many channels and thousands of targetted viewers. You could apporach some popular channels and see if they can help or build you own and offer some content.
I agree with him. If you can make content for Youtube you are a winner! Videos are really great. For example you can make an educational video or discuss something related to bitcoin and then link back to your website in description. That is good for your SEO and also will drive traffic to your site. It's also free, it only requires imagination and your time.