This advice sounds like 'do what you're passionate about', which conflicts with the research done by 80k hours, though. See here and here.

These posts are well worth reading for anyone struggling with said advice, e.g. because they aren't passionate about anything. To paraphrase (though this doesn't do the 80k hours posts justice): Find something which is valuable and which you're likely to be good at, and you'll grow to enjoy it, too.