What I would like to see to improve Zelda:
1) For all that is good and holy in this world, don't make us start as kids with zero abilities anymore. Then we have to go get the sword and build ourselves up. It's tedious
2) Get rid of those stupid "tutorial quests" in the beginning. They're so annoying
3) Nintendo needs to learn that speech is good. Link doesn't have to speak, but everyone else should now.
4) Somehow change the key system, it's a bit archaic. Make the dungeons change or something to open up new areas. Collecting little keys all the time feels so 80s
5) More expansive cutscenes. Zelda is screaming for it. This goes hand in hand with 2
6) A greater variety of puzzles. Even though I like them, they've become pretty standard. I'd like to see them put more effort into the variety
Again, these are tweaks, not enormous changes. But they would help update the series enough without making significant changes
I was there on that fateful day, were you?