If I told you to run as fast as you can, I can guarantee that after 1 minute you will be running slower than you were after 10 seconds (assuming you're giving max effort through out). That's just how sprinting works: the longer you go, the slower you will get. This is why Usain Bolt's fastest 400m time isn't just 4x his 100m time, it's slower than that. This example extends beyond physically sprinting and goes into all areas. I once had a client say "go all out or go home" during a session. I told her I didn't like the saying because most people end up going home. Most people can't handle the all out mentality...for an extended period time anyway.
The times we're living in suggests that the only way to do anything is to "go balls to the wall" and give 100% commitment and effort. I agree with the 100% commitment and effort parts. I take issue with the "balls to the wall" part.
You can only go "balls to the wall" for a week, two max. After that you're going to crash and burn. So I'd rather see you give 100% commitment and effort to less stuff. Instead of trying to change everything all at once, just pick a couple. Actually I'd say pick just one. Commit to doing one thing to the best of your ability. Keep doing it until you master it. Mastery means it takes minimal thought to accomplish. Mastery may take 2 days or 2 months or longer. Do it for as long as it takes. Then commit to something else and master that.
I know that this process will work for everyone. 100%. That being said, most people will opt for the "all out" strategy. The one we know doesn't work. Why?
The main reason is because mastering one thing at a time just isn't that sexy or exciting. It's actually kind of boring. Working out 2hrs a day everyday and doing the carnivore diet (that's a real thing) sounds way more hardcore than "eat 2 more servings of vegetables each day". Remember more is not better; better is better.
Another reason people choose "all out" is (I think) they know it will end and it will end relatively quickly. To go the 100% commitment route requires patience. Patience is one of the things that is in the shortest supply nowadays. You have to be willing to accept progress at whatever rate it comes. Most of us see progress and we want to speed it up. We should stop doing that.