All your advice is very valid and we should all follow them, although it's only to an extent.
The fact that you shouldn't take others' opinions on investment advice doesn't mean we shouldn't care about or respect what they say. It's okay to have certain people that you respect w bit and listen to, but don't follow their advice like it's a cult.
Do your own research to verify if whatever they're telling you is true or not.
This advice might seem a little controversial, but I think it's helpful. Stop over diversification, what I call over diversification is putting your money in every crypto project that comes your way.
I think it's far better to have few crypto that you are constantly, than investing violently in so many project.
Diversification is good, but it should only be for people who understand what they're doing.
To me, you should have just Bitcoin than to have so many investments where you lose all of them in the end. A lot of people just want 100x of their investments and fear of missing out, that's why they're so prone to scams.