Success is a big word which lacks information. What is success? I doubt enough people can agree on what success is for anyone to talk about it to a wide audience. For many, success is relative to others, but that's worthless because that perspective puts too much focus on the others (even if it's just a little, it's too much).
As Chris Rock said, Bill Gates would kill himself if he had Opera's money. I could feel down because I'm not where I want to be, but then I walk past homeless people on the street and realize I could be in a much worse situation. And the capable homless person might have a homeless friend who just broke a leg and can't walk. Your situation can always get worse until you're dead, in which case you don't care anymore.
We're all just trying to survive in the jungle. Even if it doesn't feel bad for us, it's still someone else's horror show. In the jungle we just have to assess our surroundings and use what we can to keep improving our situation. But we'll still always be in the jungle.
As Bear Grylls says, keep moving. Success is in the small wins that you can rack up every day by the handfulls. It's making a little progress. It's sharpening a stick. It's setting up a shelter. It's building a trap. Just keep moving. Even the failures are wins as those failures carry information.
That's probably not very helpful either. I would make a terrible self help person. ;)