Seinfeld is a Billionaire. If I ever had 1% of that, I’d never try to force myself to be relevant and happily accept I’m not relevant anymore.
I’d expect that’s in fact the natural trajectory of being in pop culture, that your time of relevance is fleeting, and plan accordingly. No hurt feelings that no one is lining up for your material anymore, it happens to almost every single person in that field. You only can make your legacy worse by trying to force things, exit on a high note.