Would you recommend to continue to buy in to SPDR S&P 500 ETF?

Can consider tqqq instead. However, you will need access to us market.

SPY is an index tracking fund so the manager isn't responsible for any of the progressive increases (instead their KPI would be minimising tracking error).

Instead, the change in value is reflective of good performance of US stock market (and underlying that, the US economy in general) and you should buy in if you have the view that it will continue to perform well.