Good suggestions.
I have one idea, not sure if it would work:
1. Let's say we can tag our note with for example: [Meme], [Picture], [Politics], [Sport], [Philosophy], [Photography], [AI-Art], [Art-No-AI], and so on.
One problem that we would face is bots falsely self-tagging their notes for unwarranted classification.
2. What if we could voluntarily embed into our profile, let's say 1000 sats as a deposit, and as long as we have that deposit there, we could utilize special tags for our notes that makes them easy to find and index based on those tags. The deposit would exist in a wallet that we could empty when we want, although then our special tag clearance would disappear.
There are certainly problems with this. How do we set a 'fair' minimum amount of deposit. Is there a risk that we alienate those who don't have 1000 sats to spare. What if the deposit was 10,000 sats. What if the price of Bitcoin increases so much that 1 sat is too high.
Just something to reflect on.