I first joined nostr in December and didn’t really get it. I posted 4 notes from December to March 1st until it really clicked for me and I became a daily user posting multiple notes everyday day. It will take time for people to understand nostr but based on the chart you shared hundreds of thousands of people have taken the first step and will be back. Eerily similar to my first bitcoin encounter!
Discussion
Yeah it's all about the different cohorts coming in the early adopters stick around because they recongise a trend, the rest are looking for social approval before they stick around and others are looking for an incentive that is stronger than that of say Twitter
For me, I get no play on Twitter, I get a lot more reach on nostr so its where I focus, I still post on Twitter, but not with the idea anyone will see it