Start with you. It's OK - That's where you'll end up in the end.
When most of us try to improve, we accidentally start at the finish line and start to work backwards. We see what somebody that's already there is doing and attempt to do that. The problem is, that doesn't work. You are trying to improve a you that doesn't exist yet.
If you're setting out to do a two hour warmup ride, then 3 x 20 minute intervals at above race pace, followed by a 10 mile brick run because you read that's what world champion Luke McKenzie's favorite workout, you're going to wreck yourself in short order. Instead, look at what is one of your own difficult workouts and do that, plus maybe a tiny bit extra.
You can't train a you that doesn't exist yet. Try, and you'll quickly be presented with the difference between the two. But do it right, and you'll continue with sustainable and solid growth that lasts forever.