All challenge is gone? No way. Your next challenge is to find a new one.

LLMs make what was formerly hard trivial, that is true. But they cannot do everything with simple prompts, you must increase your ambition to what was formerly impossible. Try building a bigger game, more complicated software or hardware…what have you always wanted but written off as something only a multi-millionaire with a large team of domain experts could accomplish? Because you have one now.

My initial reaction as well. If you believe AI has made what you do irrelevant, change what you do. If you really want to do something different, stop playing the knowledge arms race game with a computer program. There has been "analog" LLM-like ventures (aka big, rich tech corporations) for a long time, yet they didn't previously solve all engineering problems; you can now use technology as a great equalizer, or change your focus to something AI can't even do if you don't want to play the game.