Just look at what those recommended index funds have done over the years. It seems the objective of “managed” money managers is to feed off of your labor and savings “managing” any gain from your pockets to theirs. That also includes fund managers feeding at the trough.
You can’t get much more diverse than an index fund and that does not include the dow, too narrow.
Going forward is the only real factor. Avoid paralysis if what you are doing is underperforming and something else has a better track record. You probably don’t have the experience, temperment, time or resources of market intel to be a trader. I surely don’t
I have seen studies that show about half of all the gains from investing end up in the pockets of the "professional" money managers.
Managers hate guys like me who have learned to do it themselves and keep all of their gains. Even worse, I am teaching my kids to do this also -- and anyone else willing to listen.