Disclosure: I don't have a LinkedIn account.

I think the better advice is to figure out how to make your career better. I doubt anyone cares about a good LinkedIn profile, rather they care about you being successful. Suppose you were successful in some way three years from now. What would you have achieved? I feel it's better trying to go and do that than spend effort on your LinkedIn profile. Ultimately, LinkedIn is distraction to those who are extremely successful.

TLDR: Successful people will have LinkedIn, but being active on LinkedIn won't make you successful.