It squeaks again, but this time the frame of my Merida bike broken

I bought this Merida Mission Sport 15 years ago as a brand new. I've ridden at least 30,000 kilometres with it, more than 8,000 with the TSDZ2 alone.
It was fixed in the short term, but in the long term I need to look at a frame or a bike for myself.
For the repair, a 450x31.6mm 6061 seatpost was pressed into the broken seat tube and glued in place with Würth bearing glue. Fortunately, the 27.2" seatpost fit snugly into the other seatpost that was glued in place, so the bike was usable again for a while.
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