Good things here but for that troublesome first bullet... I think better advice would be something along the lines of:
"Ignore everybody who is directly competes with you, has any stake in your failure (especially through the sin envy), doesn't understand the topic very well, fails often themselves, or that you do not in general respect. And then pay special attention to all of the opposites of those."
Definitely a better plan than ignoring absolutely everyone. While it's certainly not good to be overly influenced by others, being completely unaware of what's going on isn't the best plan either... yes, I tried it.
"Ignore everybody who is directly competes with you, has any stake in your failure (especially through the sin envy), doesn't understand the topic very well, fails often themselves, or that you do not in general respect. And then pay special attention to all of the opposites of those."