For tieing down, use bigger ties !

Seriously, if you are tieing down on the sandy beach (and the Bay area is sooo nice - Went to your fantastic country for honeymoon some years ago) you need to make it more secure.

If you have an area which is well above the spring tides where you can tie down, fill 4 tyres with concreate (with a chain thru them) and dig 4 deep holes in the beach (4 feet ish if you can, more if possible) and drop the tyres in and refill the holes with sand/gravel keeping the chains above ground. You now have 4 deep buried points to tie the boat down to.

I would suggest either one tie under the mast, one under the back beam and one each side so you can down the Front and rear beams and then also Port stbd too.

Or one each side at the back bean and one each side at the front beam.

As for the mast, if there is damage to the mast wall I would just throw it away and get another mast section and transfer all the fittings over. If it is just bent then the diamond's might be able to correct it agian.