I'm assuming you sail in fresh water most of the time because of your location. Salt water is much harder on the metal parts.
With that assumption:
clevis pins & or shackles - inspect and replace if obviously worn. I've never had any break on me.
chain plates - same. Especially check the weld that holds the two sides together.
and the bolts that hold them on (shroud anchor pins) - same. Replace if bent.
the jib halyard block - same. A little lube on the axle doesn't hurt (white lithium grease) if we're talking about the stock metal one that's part of the forestay. The one on the mast doesn't need any real maintenance.
bow tangs and bolts - bolts should be no problem - make sure they're tight. I've had bow tangs break on me before. Replace them and throw the old ones in the tool box as spares.
what about trap wires - do you want to go swimming? While the boat sails away from you? Replace them.
I'm guessing that your main halyard broke at the metal/rope join. Check the halyard latch (the clip on the mast) for sharp edges. File smooth as necessary.
Thanks as always.
You're welcome.
