May be you can think about 1 spot for 1 keyword.
5 winners for 5 different keywords. Just an idea! :)
like - Earn Crypto, Earn free Cryptocurrency, how to earn cryptocurrency etc.
I believe you have better idea in your mind.
btw I could be wrong what I just said in previous comment. It would be great if someone could clear the matter.
Yes I think something like that is an option, but I will see what others have to say and perhaps do an update towards the end of the week :)
Judging by what I have seen - the newest blog replacing the previous, I think that is the way it will work for google, per search term.