Your traceroute shows that not only is the large increase in ping times well outside your control, between asianet & gcore, but also that those two locations are many thousands of miles apart - Singapore to Luxembourg.
OK - that's odd… domain name says .lu, which is Luxembourg, but the IP address shows as actually being in Singapore.
Still, that doesn't change the thrust of the answer, which is that it's well outside your control.

Your first outside hop, to singnet is only 10ms - that's the only bit your ISP is responsible for. The rest neither you nor they can do anything about.