How on earth were those people able to create such amazing things? Will I ever be able to create something that brilliant someday? What should I even make? I have so many more tools than they did, even LLMs. Where can I learn the ideas and skills they had?
Don't use LLMs except for the most menial things. Get as much practice in creating various things. Study expert-level books on related subjects. Foster your creativity in other areas too (i.e. writing, drawing, music). Don't pass up the chance to work with veteran developers; be ready for that opportunity when it comes.
The smart path: Find good mentors (and return the favor); use LLMs not to do the work but to help you learn and exercise your brain: make them test you, using something aking to teacher/Socratic method, make mistakes and get the mentor/LLM to review in a way you figure out the answer.
Find an itch, then scratch it. If many people have the same itch and can use your solution, you win.
Simple as that.
The converse: Most itches will either be idiosyncratic, and not get you much attention, or lots of people will be scratching them and it's hard to come out "on top".
I scratch lots of itches, but I also know that most of them are very, very fringe. So going into scratching itches expecting fame is not going to go well for most. But scratching itches is satisfying, so for my part at least I don't care.
Find a problem and work on a solution for 20+ years.
Start fixing the unfixable and doing the undoable things ;)