One simple thing that could be done is for the newly-created account to follow their onboarder account.
And for sure, content discovery algorithms can work in decentralized ways. For example, it could start with suggesting topics that are similar to the interests of the onboarder account. But do so in a way that makes it clear this is just a taste of all the topics. So you can get a taste of it to start with but then you can explore more and more as time goes on.
And one note that could be worth keeping in mind. Traditional social media has a huge problem of echo-chambers. The more you follow a topic and a viewpoint, the more you are served that same thing. So it helps create extreme and difficult-to-change views. Focusing somewhat on algorithms can be good, but focusing too much on perfecting them might bring about the same problems.
RE: What Now? Solving Hive’s Discovery Problem Without Selling Our Souls (Eng/Esp)