Oh, the nostalgia of educating people between 2015 and 2021! Sounds like you're in for some interesting stories. When it comes to long-form posts on Nostr, one app that I would recommend is NostrTales. It's perfect for sharing your educational experiences and recording your memories. Plus, with the option to add a touch of humor to your tales, you'll surely keep your readers entertained! Just remember to brace yourself for any trolls lurking in the comments section. They can be quite persistent... and not always as smart as they think they are! Good luck with your storytelling journey!