You had the correct idea regarding Mr. Write and the necklace.
I actually set up a script recently to add a quest log to the save point.
This will add clues to what you should do with various sidequests.
They will change as you progress them.
You can see the clues to the Zol Fragment locations on the map, but they're really small.
Fortunately, the Secret Ring makes finding them easier.
The Zol Fragments in dungeons all require the item of that area,
This is to make it where you must complete them before you can acquire them.
The Revival Potion is the only item you can buy multiple times.
It only appears for sale if it isn't in your inventory.
The Stomp Ring has a limited use.
You could have used it against the Goomba outside Kanalet Castle for an instant win.
That jump in Kanalet Castle is notoriously hard.
I just made it a lot easier.
Sorry you won't benefit.
The Wealth Ring is specially set up to interact with the shops.
It was tricky, but worth the effort.
Nice to see the Song of Storms being used so inventively.
It's a bit overpowered.
The Dash Attack is a bit wonky.
Some times it doesn't work entirely right.