It wasn't even hard to get here.
From what I've seen, this is really the thing. Having a reasonably comfortable life is just about doing what you are supposed to do. Pay attention in school and make a decent effort at learning. Be sober at least most of the time. Get a job and take it seriously. Get married and be in a position to support your children before you have children. We've understood these things for millenia and they are encoded in our religions and cultural norms.
One of my favorite quotes from Calvin Coolidge: If all the folks would do the few simple things they know they ought to do, most of our big problems would take care of themselves.
Be healthy, physically and mentally. Be born into a reasonably affluent family. Be able to attend a good school. Be able to find a partner.
Success is personal. Whatever it means to you, believing you can achieve that and working towards it against setbacks, makes it more likely (but not guaranteed) that you eventually will.
If you got this far w/o working too hard I’d suggest working a little harder to stay above your peers and diversify your future options. Gold rushes don’t last forever. Live to work (own business) or work to live (for someone else) and afford your hobbies.
"It is possible to make no mistakes, and still lose. That is not a failing. That is life."
But focusing on things you can control and having grit on average increases your chances. It’s a good default.