I'm curious - how do you explain the fact that as you look all around you, lesser number of devs are having fun?

Because their job stopped, to a large degree, involving programming.

Because for a lot of millenials and older developers coding/making thing by hand was the fun part. The endless meetings, scrum rituals, code reviews etc were the annoying parts of the job.

Now they took away coding by hand, so what's there to enjoy? In a field that was already sensitive to burn out and churn taking the joy from the daily routine doesn't help with that.

Only thing you can do is get in build something for 2 years hope you got bought by big tech before the pile of slop code collapses on itself.