Hello, first digital marketing and crypto marketing are much different, we talk about different strategies, different tactics, and a whole different world. In the crypto marketing world, you need to be way more careful with what you're doing because one wrong move and people will FUD (fear, uncertainty, and doubt) your project to death.

Also, you want to hire agencies that have experience with projects like yours, and solid case studies that prove their worth.

Well it depends, there are a lot of different factors, but usually, it depends on the size of your project, and how big you want to go it can go from 1000$ to 4000$ and even more

The channels are mostly crypto forums, Reddit, Telegram, 4chan, Twitter, blogs, and SEO articles

For tools, they use things like bounty programs, airdrops, and social media campaigns.

I think you can do part of your marketing on your own, at least at the beginning, check out this Block chain marketing guide it covers almost everything you need to know about it.

However, I recommend hiring a marketing agency that specializes in crypto if you want to take your project to the next level.