Lisp is not "forgotten". It's quite alive, kicking and running [big] circles.

Nubank (the largest digital bank in the world) using Clojure as their primary driver grew from ~12M customers in 2019 to 131M in 2025 - almost 1000% growth in less than a decade. JPMorgan that has about 80M customers took around 150 years and dozens of acquisitions.

Apple, Walmart, Netflix, Cisco, Amazon - they all use Clojure. Google and Grammarly use Common Lisp.

Check the GitHub language stats and be surprised to see Emacs Lisp among the visible top. There's so much Elisp on GitHub alone - it's just effing crazy. That fact alone at least should be surprising. Remember? This is a not a general-purpose language - it's made for one and only thing, tis a damn configuration language for a text editor. And no, it isn't "some old stuff", check r/emacs - new packages get announced daily! I'm not even exaggerating - new stuff for Emacs comes every single day. Who the heck are all these psychos? Have they not realized how "forgotten" and "dead" Lisp was?

Seriously though, Lisp dialects are enormously practical, it is inconceivable today to find a runtime where you just can't run stuff built with a Lisp. And Lispers keep adding more - Janet, Jank, Jolt, Fennel, Clojure-Dart, Cljbang, Squint - all are pretty young, yet already not some "useless toys" - they're used to build real stuff.