Well, what's wrong is your mindset, if anything. You're not supposed to do anything. npm still works, it isn't deprecated, and it does more or less the same thing as the others, only that others can be slightly faster.

But if npm/yarn/whatever works for you, just use that thing. The mindset of having to move to whatever "mainstream developers" are using today is what is causing you problem, not that alternative solutions exists in the first place.