Sell Adspace ( most simple). Around content / discovery + Sponsored posts ( Highlights that can get recommended).
Next increase time spend with more "related" content ( like amazon offers you some other shit other ppl did buy).
Partner programs with shit related to crypto and so on. This scales with time and data but it needs a "startpoint".
Best chances i see for a good revenue stream is a platform to buy and sell beyond peakd ( with tracking, data tables and so on) other front ends can also use to sell advertisement with 1 channel.
Sure that is a lot of work, but tbh it is needed. IDK if you are familiar with google adverts ( and other bidding platforms for addspace). This would be a way to earn more with more users.
And banger content would earn more ( allows a author share optional) to get better authors and more banger content.
And with a low goal like 100$-200$ a day is pretty doable ( a shit middleclass affiliate website makes that).
I think it failed in the past because the way Front ends tried to monetize was beyond unprofessional. No tools, no tracking, no automation. This is how to not do it.
It needs topic knowledge to execute it well. IDK if peakd has someone in team knowing about it. And well beyond that, it needs a passion and vision for building it.
At the end, its not difficult to make some money and scale with it.
RE: PeakD Sustainability and Maintenance Proposal