You really can just play 5E D&D.
You don't need to "fix it" so that it plays more like an older edition--if an older edition is what you want, you can still play that older edition. DriveThruRPG (and elsewhere) has all of the books you'll ever need:
4E |
3E |
AD&D 2E |
AD&D 1E |
B/X and Basic |
OD&D. Grab your favorite and get the gang together.
And it doesn't need "fixing" so that it plays more like
GURPS or
Hero or whatever other game system you have in mind-- if a different game is what you want, you can just play
GURPS or whatever instead. Again, DriveThruRPG has everything you need. Search by title, publisher, genre, rules system, format, language...if it exists they probably have it, and probably for less than $10.
If your heart's desire is to make D&D play like an older or different game, remember the reasons why older editions were left behind, and the reasons why other game systems aren't as popular. Those reasons are still there.
I'm worried about some of y'all's blood pressure. I feel like you'd be a lot happier if you just let 5E D&D be it's own game, and go back to playing X Edition rules. Or maybe you could play
GURPS or
Call of Cthulhu or (my favorite)
Dread instead of groaning constantly about how inferior D&D is supposed to be.