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If the piston was melted and the piston broke, it was probably the injector leaking.
If only the piston ring broke, there is a high probability that the cause was LSPI and poor-quality fuel. LSPI occurs in GDI engines. To prevent this, oil with the standard recommended by the manufacturer Dexos1 gen 2-3 or oils with the new API SP/RC standard are used.
Perhaps in the past, before you bought the car, someone poured bad fuel and the wrong oil, hence the piston was overloaded.
Is it worth doing? It's hard to assess without disassembling the engine. The best and easiest way is to find a bare engine pillar/block and replace it.
PS. Russian analyzes of Valvoline oil with the dexos 1 standard show that it is an average oil, not rich in engine protection additives. Better to use something better.
The analyzes concerned Valvoline oil for Europe, it may be different in the USA.
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