I got frustrated one time when I was running out of arrows and didn’t find any anywhere and no one had any to sell!
Seemed like the nearer I got to fighting Ganon all the weapon sources dried up!
Some weapons you can get fixed but it would be nice if there was a general forge where you could go...
If it is the Shrine I think it’s Mirro Shaz, Tempered Power.
I have trouble lining up but solved that by crouching and creeping up to the Ball.
Make sure you have the Sledge hammer, the harder/heavier the weapon the better, using the Sledge hammer and lining up straight Stasis the ball then hit...
I bought and furnished the Hateno house so I have 3 swords, 3 bows & 3 shields tucked away in there that I can go and get when needed and a full inventory!